sunglasses Bradley Cooper the hangover 2 autographs

Bradley Cooper and his co-stars hit the red carpet for the premiere of The Hangover Part II at Grauman's Chinese Theatre in Hollywood Thursday.

But, before they hit the carpet, the actors took the time to sign autographs and take pictures with fans! So sweet!

Seen at the premiere were stars Bradley, Zach Galifianakis, Ed Helms, Justin Bartha and Ken Jeong. There to support were fellow A-listers Jason Bateman, Robert Downey Jr., Dax Shepard, Kristin Bell, Romeo and Jordin Sparks. The flick is out May 26.

We're hearing rumors that Romeo brought Jordin as his date ...

Check out video of the arrivals below and after the jump, and see hot pics of Bradley in our gallery below!