Gwyneth Paltrow (in Antonio Berardi) made her first appearance after being named People's Most Beautiful Woman at the Hollywood premiere of Iron Man 3, where she was joined by co-star Robert Downey Jr. "I'm more in proportion now than I was when I was 20, so I feel better in a bathing suit now than I did before I had kids," Paltrow told People of how she views herself now that she's 40. "But I think one of the most beautiful things about growing up is this self-acceptance that starts to happen." And she certainly showed it last night, in Berardi's daring dress with sheer vertical paneling on the sides. The latest in the Iron Man trilogy opens nationwide May 3. Click the photo to see more of the week's parties!