Selena Gomez -- Anything Justin Does, I Can Do Better ... Tumbles Hard Onstage (VIDEO)
Selena Gomez Anything Justin Does, I Can Do Better ... Tumbles Onstage!
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Selena Gomez will tell ya ... that first step can be a real bitch when you're performing in front of 19,000 people.
She had a gig in Tulsa Sunday night, and her attempt to go down a short flight of stairs onstage did NOT go smoothly.
Instead of falling for Justin Bieber -- now she's just falling AFTER him.
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