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 Larry Busacca/Getty Images for Sony Music Entertainment 
 
 Katy Perry and John Mayer have called it quits. 
 
 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. 
 
 PHOTOS: Take a look back at Katy Perry & John Mayer's relationship 
 
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 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. 
 
 LOOK: More celeb splits 
 
 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. 
 
 
 
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 PHOTOS: Most Surprising Celeb Breakups 
 
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 RELATED VIDEOS: ||||| Robin Thicke I Haven't Given Up on Paula 
 
 EXCLUSIVE 
 
 The fat lady hasn't sung in's marriage ... at least according to him, because he has had time to think and he's now determined to winback.TMZ broke the story ... Paula called Robin on Friday to tell him she wanted a divorce ... and Robin jumped on a plane and flew to Canada and tried in vain to convince her to change her mind.Sources connected with the singer tell TMZ ... Robin desperately wants to save his marriage. We're told he's resuming his tour on Thursday where he's performing in Washington D.C., but he will NOT go out on the town -- something he liked doing in the past.We're told he wants to convince Paula he can change and be a good husband. The surreptitious ass-grabbing is a thing of the past.Sources also tell us ... Robin is really concerned about their son. He does not want him raised in 2 separate homes.The couple released a statement saying they have separated ... but our sources made it clear ... she wants a divorce. ||||| Her rep was unavailable for comment, and things are all quiet on the Twitter front. 
 
 But while this certainly isn't the first time that the "Dark Horse" singer has worn a bauble where a wedding or engagement ring traditionally goes, this is the first time her chosen diamond accessory been that big. 
 
 Of course, stars and their stylists do have access (quite literally at their fingertips) to quite the treasure trove when it comes to getting jewelry ASAP for special occasions, so this could just be yet another red-carpet statement piece. (The statement being, in this case, "Fooled you!") 
 
 A source told E! News in November that Mayer popping the question was "inevitable," and that all of their nearest and dearest were really rooting for them to get engaged. 
 
 "They are so perfect together," the insider added. 
 
 Perry enjoyed a Valentine's Day dinner date with Mayer in Los Angeles on Friday (a source told us they remained unbetrothed when we asked about the gold ring she was wearing) and then the couple were spotted strolling in Hollywood on Sunday. 
 
 She was alone—minus her entourage and a cute furry teddy bear, that is—when she touched down at London's Heathrow Airport earlier today. 
 
 Perry is due to perform at the 2014 Brit Awards tomorrow. 
 
 Also among the beauties at the Elle Style Awards tonight were Emma Watson, Lily Allen, Cara Delevingne and sister Poppy, Rita Ora, Ellie Goulding, Jessie J, Suki Waterhouse (sans Bradley Cooper), a hatless Pharrell Williams and wife Helen Lasichanh, Karolina Kurkova and Olga Kurylenko.
– Stop us if you've heard this one before, but you can officially stop wondering what the heck Katy Perry sees in John Mayer: They're over, a source tells E!. The "news" (which is painfully lacking in detail other than the break-up happened within the past few days) comes just days after the gossip world was speculating the two might be engaged, thanks to a huge diamond ring Perry was spotted wearing last week. In other estranged-celebrity-couple news, TMZ reports that Robin Thicke is determined to win back Paula Patton ... and that he'll do so by no longer going out on the town and flirting with other women. Charming!