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Is John Mayer serious about Jennifer Aniston, or did they just have a spring fling in Miami?

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While Jen was filming a wedding scene for Marley & Me with Owen Wilson in Philly on May 21st, John was doing a private concert at a Honolulu night club - the Four Seasons Lanai at Manele Bay, to be exact.

Later some locals spotted him out partying at the local bar, Rum Fire...

And even though there were no reports of infidelity (or even flirting) on Mayer's part, we have to wonder: How long will the notorious gigolo - Mayer the Player! - be able to keep things fun and fresh with his older woman?