John Mayer

Sure, we'd love to hear John Mayer cover his ex Katy Perry's 'Dark Horse' or 'Unconditionally.' But that's not likely to happen, so we'll "settle" for being blown away by his acoustic cover of Beyonce's 'XO.'

A single singer impersonating various other voices is, like, all the rage on YouTube right now. We've had an off-Broadway talent channel everyone from Demi Lovato to Alanis Morrisette in one tune and a guy singing 'Let It Go' in the voices of various Disney-Pixar characters. Now enter YouTube star Roomie, who impersonates everyone from Adam Levine to Fall Out Boy in his new video, 'One Guy, 14 Voi

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.

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.

Katy Perry has revealed why she and boyfriend John Mayer broke up last spring and the true reason she split with husband Russell Brand in her January 2014 Marie Claire cover. She looks pretty bangin', BTW!

Katy Perry and John Mayer's duet 'Who You Love,' which appears on his album 'Paradise Valley,' will be the singer-songwriter's next single. Since it's a single, it has to have its own accompanying cover art and it features the couple posing in romantic fashion.

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.

Katy Perry and John Mayer are getting super serious, but as anyone who's followed their tumultuous relationship knows, they've had quite a few ups and downs -- including quite a few splits -- in between. Thankfully, though, those are behind them ... and they even inspired Perry's smash hit, 'Roar.'