Hollywood Couples Who Collaborated, Then Called It Quits

From John Mayer and Katy Perry to Zac Efron and Vanessa Hudgens, see how long it took these couples to clock out

JOHN & KATY: 6 MONTHS

The couple proved they were in perfect harmony when they cowrote and recorded a sugar-sweet song together, "Who You Love," for Mayer's August album. But there might not be an encore any time soon: After dating on and off since summer 2012, Perry and her duet partner called it quits in February, six months after their ballad debuted.