Michael Caulfield/WireImage

If there are two things that Hollywood’s biggest stars love, it’s stylish shoes and worthy causes. And the Stuart Weitzman-sponsored celebrity-designed shoe auction is combining the two — and letting everyone from Hilary Duff to Jessica Alba get creative and give back. Twenty-nine of your favorite fashionistas have customized and autographed the sole of a Stuart Weitzman pump, which are up for auction online only between now and September 30th, with 100% of proceeds going directly to support ovarian cancer research. And while we’re feeling partial to Jessica Simpson’s bedazzled creation above, click over to stuartweitzmancelebrityauction.com to check out looks by Sarah Michelle Gellar, Rachel Bilson, Blake Lively and more to judge for yourself. Then place your bid and get in on giving back.

Courtesy Vaseline

Back in September, Hilary Duff, Minnie Driver and Kim Raver bared their body for Vaseline’s “Skin is Amazing” campaign to raise awareness for skin diseases. Now this new actress joins their ranks with these sexy shots of her favorite body part. Can you guess the star? We’ll give you a hint: Don’t let this leading lady’s petite frame fool you — she can stand up to vampires and house haunting demons with ease. If you love these shots, you can bid on these celebs’ one-of-a-kind autographed photographs in the Vaseline “Skin is Amazing” auction, with proceeds of the auction benefitting the Coalition of Skin Diseases. Bid from February 12th – 22nd on ebay.com/Vaseline. Click through to the next page to find out who’s baring their skin!

Click through to see the answer. . .

Courtesy Vaseline

Answer: Sarah Michelle Gellar!

Astrid Stawiarz/Getty

We’ve been spotting stars like Sarah Michelle Gellar in feathered frocks all year long — and we think it’s a trend that is still worth trying! Why not add a little whimsy to your day? Here are a few of our favorites.

Start small with Jennifer Behr Feather Flower Hair Pin, $98 at jenniferbehr.com or a Jennifer Ouellette Narrow Feather Headband, $50 at barneys.com tucked into your ‘do.

Go all out with a feathered dress like this BCBGMAXAZRIA Feather Trim Crinkled Silk Chiffon Dress, $384 (reduced from $640) at nordstrom.com, or this Feather Cocktail Dress, $249 at bebe.com.

Do a modern take on glamour girl feathered slippers with these Kate Spade Pink ‘Illude’ Pouf Sandal, $95 (reduced from $295) at bluefly.com or these Pinko Feather And Jewel Sandal, $388 at asos.com.

Don’t want to invest too much in the trend? Try these super-cheap Feather Dangle Earrings, $5 at forever21.com, or these Peacock Feather Earrings, $14 at fredflare.com.

Mark Sullivan/WireImage

We love the gorgeous silk and pearl Lanvin necklace that Sarah Michelle Gellar wore to the premiere of her new movie, Southland Tales. The show-stopping piece pulls together her elegant red carpet look, but we think it would look just as fresh and sexy at a holiday party with a simple black dress. Statement pieces like this might seem tough to work in to your wardrob, but you can pull it off too! Just make sure to pair an attention-grabbing necklace with an open, simple neckline and balance out the oversize piece with subtle studs or bare ears. Tell us: Would you wear a larger-than-life necklace?

courtesy kiehls; Astrid Stawiarz/Getty

Ever wonder how Sarah Michelle Gellar looks so well-rested, even when traveling? Turns out that she is a huge fan of Kiehl’s Line Reducing Eye Brightening Concentrate, which contains a high concentration of Vitamin C aimed at reducing crow’s feet and dark circles. Sarah Michelle says, “I love that I’ve found an all in one eye treatment with the Eye Brightening Concentrate — it takes care of all my eye concerns in this tiny bottlel” Get a tube for yourself, $40 at kiehls.com

DANIELLE K./DAVE V./ISBP/ZFI/bauer-griffin

Forget sweatsuits — we are so impressed by how Sarah Michelle Gellar always manages to look so put-together but still laid-back while traveling. The Suburban Girl star landed in L.A. recently, looking chic and comfy in a cashmere Vince cardigan paired with Loeffler Randall flat boots. We’ve tracked down her look and some more affordable look-a-likes that’ll let you travel in style without the movie star salary!

Snap up Sarah Michelle’s comfy gray babydoll cardigan, $298, intermixonline.com or this crochet cardigan, $35, forever21.com.

Slip on her brown Loeffler Randall boots, $690, singer22.com, or try a similar pair by Makito, on sale now for $151, down from $215, endless.com.

Can’t afford her Chanel tote and sunglasses? Try this patent version at Spiegel, $68 at shopintuition.com and these oversize shades, $38 at fossil.com.

Astrid Stawiarz/Getty

We first spotted feathered dresses back in February, and we’ve noticed the aviary influence popping up on accessories like headbands and bags. . .but we still can’t help staring at Sarah Michelle Gellar’s dress! At a party celebrating her SELF magazine cover, the Suburban Girl star wore an Alberta Ferretti dress with a totally feathered skirt that begs the question — can she sit in that?! Maybe it’s just us, but we can’t imagine wearing a feathered dress. But we want to know what you think! Tell us: Would you wear Sarah Michelle’s feathered dress? Is this a trend you would try?

Want to add feathers to your look? Try this subtle Jennifer Behr headband, $100 at jenniferbehr.com.

Jamie McCarthy/WireImage(2); Gregorio Binuya/ABACA

It may be New York Fashion Week, but Van Cleef & Arpels kicked it off with “Une Journee a Paris,” a night-to-remember party in the Big Apple. Showcasing their collection of “haute” jewelry, the party featured a fashion show styled by Annabel Tollman (stylist to stars such as Scarlett Johansson and Catherine Zeta Jones) and performances by the legendary Lido cabaret dancers (topless, wearing white fur and glittery blue costumes) and French pop-punk princesses The Plastiscines. Stars like Demi Moore, Ashley Olsen and Mischa Barton partied along with a capacity crowd of almost 1200 people! And what brought out a Chanel-clad Sarah Michelle Gellar? She told PEOPLE that not only was she on the host committee for the evening, but Van Cleef & Arpels “are the ultimate! Their jewelry is every girl’s fantasy. And I love the Paris theme.” Diamonds, Paris, fashion — what’s not to like?

Mike Marsland/Spotlight Press/Globe; Tom Vickers/Splash News

Sarah Michelle Gellar is no stranger to changing her hair color — we’ve seen her go from light Buffy-era browne to a rich brunette before. But we always think of the actress with long hair, so we can’t stop staring at her new (darker) bob! Sarah Michelle certainly has the bone structure to carry off a shorter ‘do, but we miss her long locks already! Tell us: What do you think of Sarah Michelle’s new ‘do? Love it or hate it?

Mike Marsland/Spotlight Press/Globe

With a string quartet, legions of kilt-wearing bagpipers, and one Hollywood star, the annual summer sale at London super store Harrod’s opened in regal style. Sarah Michelle Gellar arrived by a horse-drawn carriage to the legendary store, showing off her Jasmine Di Milo satin romper. Once inside, the slasher-film star welcomed the bustling crowd of shop-a-holics into the store. “This is a dream come true. I don’t know about you, but I love shopping,” Gellar said to the crowd with Harrod’s Chairman, Mohammed Al Fayed by her side. Sarah Michelle led the charge of shoppers through the bargain-laden aisles before heading up to the Georgian Restaurant on the 4th floor. Gellar’s presence puts her among the star-studded list of glamorous store-openers including Eva Longoria, Christina Aguilera, and Victoria Beckham. But some people weren’t there for the sales; they just wanted to get a glimpse of their favorite vampire killer. “I’m a huge Buffy fan, I can care less about the store,” said Sienna Ali, 20, who ditched work at a real estate firm to get a glimpse of Gellar.

MAR/SAM/Fame

– SARAH MICHELLE GELLAR, spending her day shopping in Beverly Hills. The actress stopped into Christian Louboutin where she stepped into a pair of sexy shoes and walked out with a shopping bag!

– PAULA ABDUL, loading up on cosmetics during a shopping trip to Barneys Beverly Hills. The Hey Paula star left with four makeup brushes by T. LeClerc as well as a Plaisir Lip Pencil. Abdul also bought multiple Serge Lutens products, including some foundation, mascara and various lipstick colors. She also left smelling nice, buying Serge Lutens fragrances in Gris Clair, Clair de Musc and Un Bois Vanille.

– MARIA SHRIVER, doing a bit of shopping for her governor husband, ARNOLD SCHWARZENEGGER. Browsing the men’s section at Ron Robinson S2 in Fred Segal Melrose, Shriver found a “True Love and False Idols” brand t-shirt emblazoned with the message: ‘Welcome 2 California” and a buff male bod with a split face: one-half was the Terminator and the other was Conan the Barbarian. Think he’ll wear it?

– SHANNA MOAKLER, browsing in Fred Segal Fun in Santa Monica with a female friend. During her spree, the former Dancing With the Stars contestant picked up some casual wear including Chip and Pepper jeans and a pair of jeans from VICTORIA BECKHAM’s new denim line.

– While hanging in downtown New York with her husband, Len, and daughter, Lily, 8, KATE BECKINSALE did some damage at the Calvin Klein Underwear store. Less racy was her trip into the Scholastic store with Lily.

Kushner/INF; PRESS/BAUER-GRIFFIN; London Entertainment/Splash News

From L.A. to Paris, we’ve spotted some pretty stylish celebs adding dainty gold necklaces to their summery looks. Reese Witherspoon pairs her favorite black onyx Van Cleef & Arpels necklace with casual tanks for running errands in L.A. while Sarah Michelle Gellar wears similar style to an art event in N.Y.C. Cameron Diaz opts for a heavier chain with dangling charms while sight-seeing in Paris. Whether you go for an understated gold chain like Reese and Sarah Michelle or a flirty coin necklace like Cameron, try one of our picks to add an edge to any of your summer finds.

Get the Look:
Splurge:
Kidada- Gold Ariel Shell Necklace, $166, shopkitson.com

Nardi Stran Necklace with Crystal Stations, $128, nordstrom.com

Fajil necklace, $90, jenniferkaufman.com

Steal:

Double chain necklace, $39, Double chain necklace, $39, at bebe.com

Tahliah’s gold multi-shape layered necklace, $25, emitations.com

Petal to the metal necklace, $5.80, forever21.com

RAMEY; Asadorian/Splash News online

Same day, same city, same dress — both Sarah Michelle Gellar and Liv Tyler hit the streets of N.Y.C. on Tuesday in their Tart “Denise” dresses. Both women look city-chic in their easy black jersey dresses and long gold chains. Sarah Michelle pairs hers with bow-topped ballet flats and a quilted Chanel bag, while Liv goes for flip-flops and her favorite Be & D tote. We think both women look great — and we’re loving the dress itself! Tell us: who do you think wears the dress better? Sarah Michelle Gellar or Liv Tyler?

Join the Faceoff! Pick up your own Tart “Denise” Dress, now on sale from $180 to $126 at azaleaonline.com.

Sarah Michelle Gellar has been laying relatively low recently, so we were thrilled to see her making the scene at the Tribeca Film Festival looking so stylish. Her week kicked off with a Chanel dinner, where she was the epitome of chic in her little black dress (by Chanel, of course) with jewels from the house’s fine jewelry collection. The next night, she hit the red carpet in support of her new film, Suburban Girl, in a colorblocked Chloe dress and husband Freddie Prinze Jr. as arm candy. Two nights later, she went for a simple and sexy Donna Karan sheath in trendy cobalt blue at the Festival’s premiere of The Air I Breathe. We hope this is only the beginning of seeing Sarah Michelle back on the red carpet — we can only watch our Buffy DVDs so many times!

Photo: Stephen Lovekin/WireImage; Sylvain Gaboury/FilmMagic; Evan Agostini/Getty

Our daily Star Tracks pictures often inspire shopping sprees, but it’s rare that we find ourselves wanting a head-to-toe look! But this photo of Sarah Michelle Gellar immediately sent us on a hunt. Taken on the set of her upcoming movie The Girl’s Guide to Hunting & Fishing, it captures NYC street chic at its best: Right down to the Prada bag and Christian Louboutin platforms. IMDB credits Patricia Field (of Sex & the City fame) as the costume designer, so it’s no wonder we find ourselves lusting after this look. Here’s how you can get it for yourself (with and without star’s budget).

The Top: Trina Turk pleated blouse, nordstrom.com, $194. Or Try: Victoria’s Secret puff sleeve top, victoriassecret.com, $48.

The Pants (they look leather in the photo but we like satin better): Dolce & Gabbana satin pants, saksfifthavenue.com, $1,150. Or try: Frederick’s of Hollywood skinny pant, fredericks.com, $44

The Bag: Prada Gauffre bag, raffaello-network.com, $1, 645. Or Try: ASOS ruched bag, asos.com, $38

The Shoes: Christian Louboutin platforms, saksfifthavenue.com, $710. Or try: Go Jane peep toes, gojane.com, $19

Evening updos can be daunting to most women, and many red carpet updos seem impossible to do on your own (no wonder Jessica Simpson is best friends with her hairdresser!). But this look couldn’t be easier — just combine a slightly messy bun with a thin black elastic headband. — Melissa Liebling-Goldberg

1. Freshly washed hair is too slippery to stay in place in an updo. Try to wash your hair the day before or fake it with a product like Jonathan Dirt Paste).

2. Start by pulling your hair back and smoothing it down across the crown with a brush or your fingers, depending on the texture of your hair. Curly or wavy hair can be left a little messy, like Sarah Michelle Gellar’s (left).

3. Secure the high bun with bobby pins, preferably ones that blend into your hair tone. Skip elastic bands, which can make the bun stand off your head.

4. Put the elastic band on, setting it closer to your forehead than the bun. Make sure that your band is comfortable so you don’t spend the entire evening with a headache! A touch of hair spray and you’re out the door.

Wanna see more Off The Rack stories about hair? Click here to read more. Don’t miss our hot Beauty Trends gallery for this look and more. Click here to check it out.

Photo: BARRY TALESNICK/IPOL/GLOBE