Hollywood's young thangs aren't letting their Cannes Z-lister friends get in on all the fashion action this week.No, they all headed to the Nylon party in Los Angeles wearing a whole host of fab frocks. Vanessa Hudgens and BF Zac Efron looked smitten, with Hudge doing a VB on us with an on-trend Teletubbies bun. Ashley Greene looked stunning in a zingy yellow mini while Ashley Tisdale picked a print shift dress and satin Louboutins. Hills and City stars Stephanie Pratt, Whitney Port and Kristin Cavallari all opted for very different but very fabulous looks - although we're not sold on Cavallari's hair. However, it's 90210's Shenae Grimes who's really got people talking. A quilted bed jacket and Simon Cowell's sateen trousers? Really? No. Unless stretched-crotches become a trend, we can't see this one catching on. Who's floating your style boat and who's gone overboard? You know where to vote...