"Gossip Girl" Cast Supports Chace's New Flick

The premiere of Chace Crawford's new movie "Twelve" looked more like a shoot for "Gossip Girl" -- because most of the cast showed up to the event!

Spotted at the screening and after-party with Chace and co-star 50 Cent were Blake Lively, Penn Badgely, Jessica Szohr, Matthew Settle and "Georgina Sparks" herself, Michelle Trachtenberg.

"Twelve" opens August 6.