Cameron Diaz, John Mayer Flirt Hard in Public

If only every rumored couple were sexy, shrouded in a little mystery, and didn't involve lame music. Like Lauren Conrad and Sean Zastoupil.

But alas. We're forced to report to you that John Mayer and Cameron Diaz (yawwwn) were spotted getting their PDA on over the weekend.

The pair, who were first spotted out together in the city last week, were "all over each other" and "super flirty" at the Bowery Hotel Friday, an onlooker said.

Mayer and Diaz, who sat together on a couch in the back of the patio, "were laughing and talking a lot" as the waitress brought several rounds of drinks.

Last Tuesday, the pair were spotted having dessert at the French-Vietnamese restaurant Indochine.

"It looked like a casual date," said a source. "[Cameron Diaz] was giggly. She was laughing and seemed happy."

Asked if the newly-close pair are dating, a source close to Mayer says, "Yes, it's definitely true."

Diaz, who is filming What Happens in Vegas... in New York, split from longtime boyfriend Justin Timberlake back in January.

For his part, John Mayer ended his on-again, off-again relationship with Jessica Simpson's boobs in June.

At least he has his music. Especially that "Wonderland" song. That's gotta cheer him up.