Lady GaGa Goes Down in Canada

11/30/2009 2:15 AM PST
Another slip for Lady GaGa ... only this time it didn't involve her nipple.

GaGa fell on her partially-bared ass during a performance in Canada this weekend -- right around the :20 mark. But like a true pro, GaGa immediately pulled herself up and began dancing like nothing happened.

... it's gonna be O.K.