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ELISABETTA CANALIS!

6/5/2013 12:01 AM PDT BY TMZ STAFF

0605_guess_the_butt_revealYes! That taught tush is property of Elisabetta Canalis -- George Clooney's ex-girlfriend!

The 34-year-old Italian stunner rocked a teeny tiny bikini at an L.A. pool this past weekend ... proving that George's loss ... was truly Steve-O's gain!

Then again, Clooney's banging Stacy Keibler these days ... so he didn't exactly lose either.

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