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I know you were wondering, so here's an update on the love life of Katy Perry and erstwhile boyfriend John Mayer. If their behavior and body language at "Girls" star Allison Williams' wedding this weekend is any indication, the two are definitively dating once again. Perry and Mayer arrived at the Wyoming-set ceremony separately, but pretty soon they were inseparable, holding hands and snuggling and sitting all close and junk.

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"They are definitely back together," a source tells People magazine. In fact, the only time during the festivities they deigned to leave each other's side was when each of them performed a song for the bride and groom. So that's how you get John Mayer to perform at your wedding! I was wondering.

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