John Mayer Marks 35th Birthday By Dating Katy Perry Again

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John Mayer turned 35 this week. Yay.

He is also dating Katy Perry again. Sigh.

John Mayer in Las Vegas

Looks like Perry is determined to make sure he's not "The One That Got Away," though some think she needs to be more "Wide Awake" and see what's going on here.

Guess there's really a "Firework" between them. Okay, we'll stop.

The two were photographed together again on Tuesday night, where Mayer celebrated his 35th birthday with about a dozen pals, Katy Perry among them.

Decked in a ladylike floral dress, Perry sat right next to the birthday boy during the low-key meal, which went on for several hours; his father was also there.

"It was a very tame and civil," a witness says. "They talked and laughed but nobody got crazy. Everyone looked like they were having fun. John seemed happy."

"John had a great time. He's matured."

Sure he has.

Mayer first began dating the recently divorced singer back in June ... reports soon surfaced that Katy was in love with John Mayer and felt she could change his ways.

They split, got back together, split again and now this.

What do you think: Katy Perry and John Mayer ...

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John Mayer Biography

John Mayer With Long Hair
John Mayer is a singer, songwriter, guitar player and Grade A douchebag hailing from Connecticut. The cheesy musician has become a major... More »
Bridgeport, Connecticut
Full Name
John Clayton Mayer

John Mayer Quotes

The feathered cut projects an attitude of ease and quiet confidence that seems to have all but eluded our generation. This is a work in progress, and as my hair grows longer it will serve to become a more stirring and poignant statement.

John Mayer [on haircut]

To adults who will vote for him, Barack Obama represents a return to prosperity. To the youth, he represents an introduction to it.

John Mayer