John Mayer

On, off, on, on, off. Up, down, up down. Katy Perry and John Mayer's romance sure is a roller coaster. Months after reports that an engagement was inevitable and weeks after Perry was seen wearing a rock on that finger, the musical duo is said to have split… again.

A few months ago, an insider said that a Katy Perry and John Mayer engagement was inevitable and that they were on that path. Did they finally become betrothed?

Looking festive in an ankle-length red dress, Katy Perry appeared on 'Ellen,' with holiday sweater-wearing BF John Mayer, who admitted to being in end-of-year, cozy mode.

Even though Katy Perry's first marriage ended in divorce after only 14 months, the singer's relationship with reformed Lothario John Mayer is going so well (despite that hiccup this past spring), that sources say it's pretty certain that they will get engaged.

Off and on couple John Mayer and Katy Perry are firmly back on -- possibly permanently, if he has anything to say about it, because some sources are saying he's asked her to marry him.

We all knew Katy Perry and John Mayer were getting serious -- but who knew they were getting serious so fast? Sources say that John Mayer have already popped the question to Perry ... and he didn't get the response he'd hoped for.

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.

John Mayer has really turned his act around, and his latest "awww"-worthy deed might just be his kindest act yet.

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...