By Rose Walano
Updated Sep 25, 2012 @ 4:30 pm
Credit: Lester Cohen/WireImage

At the Hollywood premiere of Pitch Perfect, castmates Anna Kendrick, Rebel Wilson (in ABS), and Elizabeth Banks (in Alexander McQueen) looked right in tune. "Thanks to everyone for making the Pitch Perfect premiere last night so awesome!" Wilson tweeted. The musical film opens in limited release starting this Friday, September 28th. Click through the gallery to see more photos from this week's best parties!