Celebrity Mystery Ass

And the Butt Belongs To ...

6/5/2013 8:35 AM PDT BY TMZ STAFF
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This smokin' hot celebrity butt was spotted at a pool in L.A. this weekend ... but the question is -- WHOSE ASS IS IT???

Here's a tip ... she used to bang a SUPER famous person ... and then moved on to a not-as-famous person.

Can you crack the case??