Credit: Jon Kopaloff/FilmMagic

Bradley Cooper has suffered a bronze blunder.

On Monday, the actor, 35, hit the Hollywood premiere of his new romantic comedy Valentine's Day - with only about 2/3 of his face tan.

The patchy look didn't seem to bother him too much.

Sans girlfriend Renee Zellweger, Cooper spent most of the night chatting up costars Julia Roberts, Jessica Alba and Patrick Dempsey. (See more red carpet pics here!)

Cooper recently signed on to star in McG's upcoming comedy This Means War, playing a man who is in love with the same woman - played by Reese Witherspoon - as his best friend.