Hayden Panettiere and Emma Roberts
Credit: John Shearer/WireImage

"It was like summer camp!" Emma Roberts (in Burberry) told us about filming Scream 4 when we caught up with her at the Hollywood premiere last night. "We all had a really good time." Roberts and co-stars Hayden Panettiere (in Zac Posen), Courteney Cox and Neve Campbell also had a good time catching up at the horror flick's after-party. In New York City, Evan Rachel Wood and Alexis Bledel hit the Museum of Modern Art for a more low-key (though no less star-studded) premiere of Robert Redford's Civil War drama, The Conspirator. And that's not all. See more photos from last night’s hottest parties in the gallery.