A source close to the pair exclusively tells E! News that Perry broke up with Mayer within the last few days.
No other details about what prompted the "Dark Horse" singer's decision were forthcoming, but Mayer was noticeably absent from Perry's side on her recent trip to London and Milan. She returned home to Los Angeles on Friday.
Despite some early ups and down, the musical pair fast became one of Hollywood's hottest couples, sweetly gushing about each other in interviews and collaborating on the song "Who You Love," off of Mayer's latest album, Paradise Valley.
The duo have been the center of engagement rumors for quite some time now, with the most recent round of are-they-or-aren't-they being sparked by the huge diamond ring Perry was wearing at the Elle Style Awards last week in London.
Perhaps the glittering accessory was just for style after all.
A source told E! News in November, however, that the next step seemed "inevitable," and that all of their nearest and dearest were really rooting for them to stay together. "They are so perfect together," the insider added.
The Prism artist once called Mayer a "genius" and told E! News, "I've been a fan of John's for years before I got to actually kiss him."
About their musical collaboration, she added, "I've been such a fan, I think he's so incredibly talented and gifted and a genius songwriter. So to be a part of anything he was doing was just natural."
The two first went public with their off-and-on romance in summer 2012. They split briefly, reconciled, called things off again last March, but then seemed to be going strong once again.