A source told E! News that the Roar singer and her beloved have ended their relationship.
The source told the site that Perry broke up with Mayer several days ago and flew to London and Milan alone.
The two collaborated on the song “Who You Love,” from Mayer album Paradise Valley.
The news is surprising given that since Valentine’s Day Katy has been seen with a sparkler on her left ring finger.
No rep for the singers has made any comments yet. They started dating in the summer of 2012, not long after Perry’s divorce from Russell Brand.