Peter Wintersteller/Berliner

In spite of Kristen Bell’s busy acting career, the Couples Retreat star still took the time to make saving the world look stylish. Last week, Bell joined Pete Wentz and Rachel Bilson to co-host the Guess/Vanity Fair party in Los Angeles to launch special edition organic Guess T-shirts that benefit the nonprofit organization Invisible Children. Pairing one of the T-shirts with a sexy Vena Cava dress and Christian Louboutin pumps, Bell talked to PEOPLE about her involvement with the organization, which promotes youth education and economic development in war-torn regions of Central East Africa. “It’s just standing up for humanity, which I think is really important for us to do for each other,” she said. Bilson agreed, saying, “It’s also important to spread the word about these T-shirts. You can buy them, and all the proceeds go to Invisible Children.” The party stayed lively with Wentz behind the DJ booth and attendance by celebrity friends such as Annalynne McCord and Eliza Dushku with boyfriend Rick Fox. Buy your own Guess Invisible Children T-shirt for $26 on Guess.com, with 100% of the proceeds going to the organization. –Susan Yara

Jeff Vespa/Wireimage

For a sexy, flattering shape, look no further than Phillip Lim.  His intricately beautiful designs and unique structure continue to garner attention from fashion-savvy celebrities, who rushed to help the N.Y.C. designer celebrate the one year anniversary of his West Hollywood boutique. “The shapes are unbelievable. I’m a girl without much shape on my own so I appreciate a designer who knows how to accentuate a women’s body,” 90210 star, Shenae Grimes told PEOPLE.  Adds host Rachel Bilson, “He really designs for every women.  Every article of clothing is amazing, you literally walk into his store and want everything.  If I had it all in my closet I’d be like the best-dressed person!” The store itself is another example of Lim’s attention to detail.  The designer and California native said,  “The store is just a simple palette, when you walk in, it’s like the cleansing of the palette when you go inside it exposes all the tastes and the spices.”  That spice is what makes Molly Sims a fan, “Everything is a little off.  He’s never going to put something together that is expected…and he pulls off being very conservative in a very vintage way. Wanting to create a special night reminiscent of a summer concert, Lim chose his favorite band, The Duke Spirit to serenade the crowd on the outside patio and personally consulted with his celebrity clients before the event.  Of her outfit, Kristen Bell simply said, “He (Lim) picked it for me so I just said “ok, I’d be happy to [wear it]!”–Michelle Ward

Steve Granitz/WireImage; INF; Steve Granitz/WireImage

Rachel Bilson, Scarlett Johansson and Kristen Bell might have completely different looks, but one thing they all have in common is their stylist Nicole Chavez. For Sunday night’s Teen Choice Awards, Nicole tells PEOPLE, “I wanted a very casual, fun, young vibe — I was gravitating towards really soft palettes,” for all her clients. Rachel was Nicole’s first client four years ago when they met on the set of The O.C. and Bilson encouraged her to start styling. Rachel, who won for Teen Choice Movie Actress Action Adventure for her thriller Jumper, wore a blue one-shouldered Brian Reyes dress (someone that Rachel “loves working [with]“). Of her longtime client, Nicole says, “Rachel is very natural with fashion. She’s not afraid to wear something that is a little different or unexpected.” Kristen Bell “immediately gravitated” to her Jenni Kayne hot pink skirt and nude cami. Of the look, Nicole says, “The color combo’s great. It’s super modern, cute. Perfect for Teen Choice.” For Scarlett, it was a Matthew Williamson chiffon dress with a burst of colors on the beaded shoulders, but, says Nicole, “The real statement will be about the jewelry. It’s fun to layer things and be more bold.” All the pieces were from Scarlett’s friend jewelry designer Sonia Boyajian, who designed her engagement ring. Like Rachel, Nicole says Scarlett isn’t afraid of a fashion risk. We love all Nicole’s girls’ looks. Tell us: Who was your favorite– Rachel, Kristen or Scarlett?

Steve Granitz/wireimage

It’s that time of year again when we’re all trying to refresh our spring wardrobes. One trend you won’t want to miss? Flirty black and white graphic patterned dresses. Your votes let us know how much you love those print frocks with sweetheart necklines, featured in our latest Trends Gallery. So we tracked down Kristen Bell’s exact dress, as well as other similar styles to help you get this standout spring look even on a shoestring budget.

Get Kristen’s Look!
For Real:
Jay Godfrey dress, $510 at neimanmarcus.com

For A Steal:
Twelfth Street by Cynthia Vincent silk dress, $382 at ronherman.com

BCBG Max Azria floral print hammered satin dress, on sale for $196 at bloomingdales.com

Shoshanna’s black gingham dress, now on sale for $163 at bluefly.com

Silk chiffon dress, $148 at whitehouseblackmarket.com

Jordan Strauss/WireImage

What man is lucky enough to elicit declarations of love from Ashley Olsen, Rachel Bilson, Hayden Panettiere, Molly Sims and Kristen Bell — all on the same night? Shoemaker extraordinaire Christian Louboutin, of course! Young Hollywood’s A-list turned out to fete the french designer at an exclusive cocktail party in Hollywood last night. Hayden (in a Trina Trunk halter top) gushed to PEOPLE of her platform pumps, “these were my birthday gift, and I’ve had one pair like every week since. I’m addicted, but I’ve only bought two. I don’t know how I’ve managed to acquire [them]. It’s like they’re popping out of the woodwork!” While Hayden and Heroes costar Kristen Bell whispered in a corner, Molly Sims revealed she’s been a fan of Louboutin for over a decade. “They’re comfortable, they’re stylish — he just hits it whether it be with the ribbon or the cork or the platform. I mean, have you seen the new sexy shoe boot with the zipper up the front? He’s incredible!” Echoing the ultra-luxe shoes wearability and comfort was Friday Night Lights‘ Minka Kelly, who claimed “the first day that you wear them it feels like you’ve worn them for 4 years. You can wear them all day long, and they’re really the most comfortable shoe I’ve ever worn.” As for the man of the hour, Louboutin told PEOPLE that his success “comes from a very simple thing is that when you”re designing things, people can see the pleasure in doing what you do, and my biggest pleasure is actually my work and is designing shoes.” Lucky for us!

Check out a selection of Christian Louboutin’s shoes at saks.com.

Alberto E. Rodriguez/ Getty

As if stars needed another reason to head to Saks! The Elie Tahari boutique opened inside Saks Fifth Avenue in Beverly Hills Tuesday night and Marcia Cross, Kristen Bell, and Big Shots‘ Jessica Collins stopped by to check out Tahari’s super soft v-neck tees, cashmere sweaters, silk tops, and tailored slacks. Inside the party, Cross chatted with a girlfriend while Bell caught up with two male friends and sipped champagne. “A friend of mine actually started working with [Elie Tahari] and said ‘you’ve got to see their stuff’ and I wasn’t familiar with them before,” Bell told PEOPLE. “I think that the same year he blossomed and started having events like this and designing in a different way,” For new mom Cross, the event was even more exciting. “Can we shop tonight?” she asked PEOPLE on the way in. “I don’t get out of the house anymore, so if we couldn’t shop tonight, we’d go at nap time tomorrow.”

Aussenard/WireImage; Tran/FilmMagic; Aussenard/WireImage

It’s all about Melrose Place — no, not the show — the actual street! Monique Lhuillier, the favorite of A-list actresses and brides alike, has relocated to her new West Hollywood boutique to just down the street from Oscar De La Renta and Marc Jacobs. “I’ve had such great Hollywood support since we started 9 years ago,” Lhuillier tells PEOPLE. “So to have a flagship store that is this beautiful and big allows us to show the whole Monique Lhuillier lifestyle and brand.” The new 4,200-square foot store features her new line of handbags as well as a bridal section and racks of couture gowns. Sure to be a popular spot during awards season, the store also boasts a VIP entrance and fitting rooms. Stars like Kristen Bell, Becki Newton, Rebecca Gayheart and even First Lady of California Maria Shriver came out to support the opening. Wearing a daring ruffled black and white dress, Kristen Bell said, “Monique knows how to design for petite women like me, because she’s small. Her dresses are so feminine and delicate but still bold.” After walking in, Maria Menounos added, “there’s nothing boutique about this. It’s a mini luxury department store!”

George Napolitano/FilmMagic;Clark Samuels/startraks;Jason Merritt/FilmMagic

What better way to show off a fabulous new dress than to keep your heels simple? With such bright colors in for the fall — hot pink, turquoise, purple and vibrant patterns — you should invest in a good neutral shoe. Take a cue from Jessica Alba in Celine mary janes on CBS The Early Show, Ivanka Trump in matte nude heels at a Trump Hotel launch in New York City and Kristen Bell in Kenneth Cole peep-toes at the Superbad premiere. Keeping your heels neutral will not only play up the rest of your outfit, but will make your legs look miles longer! Check out a few of our favorite tan heels:

Dolce Vita double strap patent Mary Jane, $122, dolcevita.com

Steve Madden “Eloppe” platform heel, $110, stevemadden.com

Anne Klein “Wishful” patent pump, $79, macys.com

Jason Merritt/FilmMagic

We can’t stop thinking about shopping for our fall wardrobes, and Kristen Bell’s minidress that she wore last night to the Superbad premiere is a perfect starting place. The lightweight fabric and short sleeves make it perfect for now — and when the weather cools, just add a turtleneck and tights! Get Kristen’s ruffled Kyumi dress in purple (or blue), $215, at revolveclothing.com, or for a less expensive version, try this one, $68, at urbanoutfitters.com. Finish the look with a pair of nude peep toes like Kristen’s sold out Kenneth Cole ones. Try the “Fatima” by Guess, on sale $51 from $99, at piperlime.com for a similar look.

Noel Vasquez/Getty

We thought that Kristen Bell’s summery yellow minidress and straw sandals at the Sicko premiere in L.A. were totally sweet and breezy — perfect for a hot summer night. But when we realized that we could get her whole look on sale, we really loved it! Get Kristen’s look on sale by clicking on our handy links:

Twelfth Street by Cynthia Vincent “German Shepherd” Tunic $175 from $249 at shopbop.com

Stella McCartney Raffia heels, $230 from $345 at barneys.com

The Veronica Mars star caught up with PEOPLE’s StyleWatch and gave us the inside dish on how she gets her skin so glowing. Before any makeup, her skincare secret weapon is to give herself an at-home facial with Kate Somerville’s Kate in a Jar, $85, katesomerville.com. “My skin feels rejuvenated and has a healthy, clean glow,” says Kristen Bell. For her fair coloring, she uses Jane Iredale PurePressed Base in Amber, $48, janeiredaledirect.com or Stila Sun, $24, stillacosmetics.com to “warm up her complexion.” To give her cheeks a little extra flush, Kristen swears by Tarte Cheek Stain in Tipsy, $28, tartecosmetics.com. For basic lip color, the actress uses Vincent Longo Lip and Cheek Gel Stain in Liquid Kiss, $23, sephora.com, but to plump her lips she goes with LipFushion Lip Plump and LipFusion XL, $36 and $50, sephora.com and her lip balm of choice is Kiehl’s Baby Lip Balm, $8, (call 800-543-4571). And finally for her eyes, Kristen swears by Clinique Naturally Gloss Mascara in Jet Black, $13.50, clinque.com because “it never gets clumpy!”

Photo: Brian Ach/WireImage; alex cao(2)

As you can see in our April StyleWatch issue, stars like Camilla Belle (in Miss Sixty), Kristen Bell (in Yigal Azrouel) and Sienna Miller (in Christian Lacroix) are putting a fresh spin on the classic LBD. Graphic patterns and florals in the most classic of color combos can bring you from day to night. Why not try one with a low heel for day? Check out some of our favorites and then tell us what you think of the trend.

Splurge:
Yigal Azrouel bubble tank dress (as seen on Kristen Bell), $885, yigal-azrouel.com

Thread Social silk swirl print swing mini dress, $730, intermixonline.com

Diane vonFurstenberg “Gaby Dress” long bell sleeves, thigh lenghth and deep v-neck, $345, scoopnyc.com

Steal:
Ann Taylor snapdragon print silk dress, $148, anntaylor.com

Lux Ethnic one shoulder printed dress, $68, urbanoutfitters.com

Rose Tube dress with button detail, $23, forever21.com

Photo:Scott Wintrow/Getty; Brian Ach/WireImage; INF

Besides supporting independent films, Sundance is not exactly your typical film festival. While starlets swan around Cannes and Venice in gorgeous gowns, actresses hit the streets of Park City, UT clad in fuzzy boots, tucked-in jeans, ski parkas — and this year, it seems there is one hat that everyone must have! Stars Keri Russell, Gretchen Mol, Kristen Bell, Sienna Miller and Famke Janssen have already been spotted in cozy beanies in neutral shades from oatmeal to gray. Now this is a trend we can get behind — wearable, weather-appropriate, and affordable! The only question that remains: What to do about hat-head?

Check back every day this week for more Sundance coverage on Off the Rack.

Photo: Dan Gorder/FilmMagic;Michael Tompkins/FilmMagic;Peter Kramer/Getty