John Mayer and Katy Perry are making sweet music together.The couple, who are now back together after splitting in March, have recorded a duet they wrote together, Who You Love, for Mayer's new album, Paradise Valley (due out Aug. 20.) The lyrics provide some insight into their romance.

John Mayer's latest single Paper Doll has many fans speculating that the song is about his ex, Taylor Swift.During a performance on the TODAY show Friday, July 5, the 35-year-old singer was asked to address rumors that his new single was written in response to Swift's 2010 song, Dear John.

Are they back together again? Are they back together again? Katy Perry shared a photo on Instagram embracing a man presumed to be her ex-boyfriend John Mayer on the Fourth of July.

Kevin Hart will host the third annual Philly 4th of July Jam, as part of the Wawa Welcome America! Festival, and fans across the U.S. as well as the world can watch the live stream online or the telecast on VH1.