• JOHN & KATY: 6 MONTHS photo | John Mayer, Katy Perry

Credit: Mario Sorrenti

Published: Wednesday February 26, 2014 18:15 PM EST



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.

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