2010 Costume Institute Gala Arrivals Have Started!

Miuccia Prada and Lady Gaga in Prada

>> It's officially Costume Institute Gala time: Anna Wintour, in her requisite Chanel couture, and Bee Shaffer, in Balenciaga, are among the first to arrive. Anna is chatty, joking about the humidity's effect on her newly-blonder hair, while Bee, complaining that her feet hurt, won't talk with press. Evening co-host Oprah appears on Oscar de la Renta's arm (she's wearing a custom-made gown by the designer), to deafening cheers, and shrieked with excitement at Iman's arrival.

Jessica Alba, in Sophie Theallet for Gap, meanwhile, reportedly had trouble maneuvering in her dress — her husband Cash Warren had to practically carry her up the steps. Marc Jacobs arrives in a baseball cap — "I had a hair transplant," he explains — and doesn't stop for pictures; Lorenzo Martone, on the other hand, walks the red carpet with client Alessandra Ambrosio.  And fashion week buddies Andre Leon Talley and Whoopi Goldberg appear again together tonight in matching white Chado Ralph Rucci robes.