Rachel Bilson hid any signs of jet lag last night when she stepped out to celebrate Derek Lam's eBay collection at his NYC store. It's been a fashionable few days for the starlet, who jetted back to the US from France after checking out Karl Lagerfeld's Chanel Cruise collection in Cap d'Antibes alongside Blake Lively, Vanessa Paradis, and Clémence Poésy on Monday. Zoe, meanwhile, has been in NYC, where she hit a Met Ball afterparty last week in one of Derek's designs. Rose Byrne also stepped out to toast Derek's capsule collection for eBay during a break from her Bridesmaids promotion. She and Zoe were together for a fashionable bash two weeks ago as well, when they attended a Chanel dinner honoring the Tribeca Film Festival at the Odeon restaurant.