John Mayer

When Taylor Swift puts out a song, everyone has an opinion: The music critic, the die-hard fan, the hater (who's gonna hate, hate hate) -- and yes, the person who inspired the track.

Between Lady Gaga, Carrie Underwood and Calvin Harris, these stars will keep you entertained — and you can watch their clips without having to leave Twitter.

Katy Perry and John Mayer were seen, once more, getting cozy during a Grateful Dead show.

Ed Sheeran and John Mayer performed 'Thinking Out Loud' at the 2015 Grammys and the PopCrush editors were literally weeping from the beauty of it all.

John Mayer guest-hosted 'The Late Late Show' last night (Feb. 4), and of course, he couldn't resist gushing about Katy Perry's epic Super Bowl performance.

Katy Perry has finally and officially confirmed what the world knows and is painfully obvious -- that she and BF John Mayer have split.

Juan Pablo Galavis has drawn so much negative attention that even John Mayer is weighing in with his two cents! (Who knew he was a secret 'Bachelor' fan?) Mayer took to Instagram yesterday, March 12, to share with fans his complete facial analysis of Galavis, who has been labeled "Worst Bachelor Ever" by fans and celebrities alike.

Ouch! After Katy Perry went on an Aussie TV show to say that she pulled away from Miley Cyrus when the singer tried to slip her the tongue in their kiss-seen-round-the-world because "God knows where that tongue has been," Miley has retaliated, rather meanly, on Twitter.

While Katy Perry sidestepped the direct question about having a boyfriend, her reported ex John Mayer praised the singer for her work ethic during a radio interview.

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.