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.
Lady GaGa Goes Down in Canada
11/30/2009 2:15 AM PST BY TMZ STAFF
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