Gaga & Stage Have Bad Romance -- Slips Again!

12/17/2009 11:37 AM PST BY TMZ STAFF
Lady Gaga is a pro at going down.

Lady Gaga: Click to watch
For the second time in her Monster Ball tour, Gaga landed flat on her ass during a performance of "Bad Romance" Friday night in Vancouver.

Like a seasoned vet though, she continued without missing a rah-rah-ah-ah-ah.