Britney Spears and her boyfriend Jason Trawick are still going strong, but last night, the two seemed a bit on edge while out in Hollywood.

After leaving a parking garage, their white Mercedes G-Wagon was stopped at a light ... and when photographers tried to snap their picture, Brit's BF rolled down his window and threw a drink at the cameras.

What happened to smiling? Still love you Brit, but keep your man in check!