John Mayer

John Mayer loves Katy Perry -- and he also loves her massive new single, 'Roar.' The 'Paradise Valley' crooner couldn't stop bragging about his lady love's new song, as well as his collaboration with her, 'Who You Love.'

Katy Perry admitted to being madly in love with John Mayer in her Vogue cover story earlier this summer, despite being broken up at the time. They were seemingly reunited on Fourth of July and now, they get romantic on the song 'Who You Love,' a slow-burning, 'early '80s-inspired soft rock duet.

What the what? These two lovebirds are moving at lightning speed! Not only have Katy Perry and John Mayer reunited (and it feels so good!), but there are now reports circulating that they are moving in together. *Gasp!*

If the matching patriotic shirts from Fourth of July didn't convince you that John Mayer and Katy Perry were an item and "on" again, perhaps this video of Mayer, revealing how and why he fell in love with "my Katy" while performing a 'A Face to Call Home,' will...

Now that Katy Perry and John Mayer are back on again, the 'Fireworks' songstress is laying down some ground rules.

Are they? Aren't they? Are we? Izzle?

Katy Perry has been a busy lady. In between platonic wedding-watching with Robert Pattinson, she managed to throw an A-list Memorial Day party -- and one of her invited guests was off-and-on boyfriend John Mayer. Cue the "oh no, not again" eye rolling.

John Mayer may have admitted to Ellen DeGeneres on her namesake show that his now-defunct relationship with Katy Perry was private as they entered and exited it, but some new details have come to light about why the pair split.

John Mayer was a guest on 'The Ellen DeGeneres Show' and while he did address his breakup with Katy Perry, he didn't actually say much about it.

Katy Perry proved to be too much for John Mayer, who couldn't deliver the level of commitment the candy-coated, whipped cream shooting starlet needed. Sources close to the pair said their breakup was a long time coming, and that nothing was as rosy as it seemed.

Katy Perry stepped out on Valentine's Day with a gift from her boyfriend John Mayer: a heart-shaped ruby ring that she wore on her left ring finger to make the paparazzi explode. TROLOLOLOLOLO. Now rumors are flying that the couple plans to wed, despite their reps neither confirming or denying an engagement.

Katy Perry and John Mayer had a romantic Valentine's Day date, and possibly in an effort to make us all care, Perry was rocking a ring. On that finger.