Gwyneth Paltrow wore a figure-hugging Stella McCartney to the Met's Costume Institute Gala in NYC tonight. The gorgeous gown showed off Gwyneth's hot body with a sexy slit and cutout back. She was among many other stars to don looks from the designer, including Kate Hudson, Naomi Watts, and Rihanna. Gwyneth took a minute to chat with a Chanel-clad Blake Lively on her way into the event, after her pals Jay-Z and Beyoncé Knowles already made their entrance. Make sure to weigh in on all the 2011 Met Gala red-carpet looks with Fab and Bella's live love it or leave it polls!