Last week they were supposedly engaged... this week John Mayer and Katy Perry have reportedly split! A source told E! that Katy broke up with John within the past few days.

Report: Katy Perry and John Mayer Split
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Some speculate the “Dark Horse” singer called it quits with Mayer when she returned to L.A. on Friday after a trip to London and Milan.

The pair went public with their on-again/off-again relationship in September 2012, but split in March 2013. By the summer they were going strong again. A few weeks ago Katy sparked engagement rumors with a new ring.

Last year, Perry opened up about Mayer to "Extra's" Mario Lopez. She explained, “There's a lot of understanding when you get home and say, ‘Ah, I had a pretty crappy show.’ They're like, ‘I understand because I've had one, too.’ You get to share music. The dance parties are a lot more fun.”

Katy and John even collaborated on the song “Who Do You Love” last year, and made an adorable video to go with it.