We get pretty excited when MAC announces a new celebrity collaboration. So this week we (we being, from left, style news editor Alex Apatoff, writer/reporter Jackie Fields and associate style editor Brittany Talarico) decided to test out four new star lipstick collaborations by the brand. From Lorde’s dramatic “Pure Heroine” to Kelly Osbourne’s polarizing light purple shade and Rihanna‘s very-glam red, we decked our pouts (and polled the office!) to find out our faves. Check out the photos, below, along with our reviews and our ratings, from 1 (would never wear again) to 10 (we plan to wear this every day).