SJP, Nicole Richie, Rihanna . . . Stars Who Moonlight as Designers

You love the way they dress, so it stands to reason that you'd want to wear their clothes. While Taylor Swift, Kate Moss, and Nicole Richie aren't actually set to loan you their red carpet gear, they've been more than happy to collaborate on the sort of designs that fit their aesthetic with the retailers they love. From Chloë Sevigny's ultrapopular Opening Ceremony lines (which continue to show at Fashion Week!) to Lindsay Lohan's infamous onetime turn as Ungaro designer and Rosamund Pike's for...