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 Taylor Swift’s feud with Katy Perry did start over a guy — and sources tell Page Six it was John Mayer. 
 
 After Swift mentioned a “straight-up enemy” about whom she’s written a new song, “Bad Blood,” in an interview with Rolling Stone, Perry tweeted to call out a mystery mean girl, “Watch out for Regina George in sheep’s clothing.” 
 
 Swift said in the interview, “Oh, we’re just straight-up enemies. And it wasn’t even about a guy! It had to do with business. She basically tried to sabotage an entire arena tour. She tried to hire a bunch of people out from under me . . . I don’t think there would be any personal problem if she weren’t competitive.” 
 
 Taylor and Mayer had a love affair in 2010 before he dumped her. 
 
 She released the song “Dear John” with lyrics, “Don’t you think 19’s too young to be played by/Your dark twisted games.” 
 
 In 2012, Perry started dating Mayer, who said he was “really humiliated” by Swift’s song. Music sources told Page Six, “Perry started making digs at Taylor from then on.” 
 
 While it was reported that several dancers left Swift’s tour for Perry’s last year, Swift appeared to confirm earlier tensions between them, telling Rolling Stone, “For years, I was never sure if we were friends or not. She would come up to me at awards shows and say something and walk away, and I would think, ‘Are we friends, or did she just give me the harshest insult of my life?’ ” 
 
 Reps for the two singers, who were seated in different sections at the recent VMAs, didn’t get back to us. ||||| Is Katy Perry the mystery woman Taylor Swift shades in Rolling Stone? 
 
 The "Shake It Off" singer griped about a pop peer in the magazine's Sept. 25 issue, but in typical Swift style, she refused to name names. Perry implied she's the one Swift declined to identify by referencing 2004's Mean Girls. "Watch out for the Regina George in sheep's clothing..." the singer tweeted Tuesday. 
 
 Does that make Swift Cady Heron in this scenario? And is mutual ex John Mayer the Aaron Samuels? Regardless, the 24-year-old "Mean" singer has yet to reply to the 29-year-old "Firework" singer's tweet. 
 
 The ex-country star implied Perry was the inspiration for the song "Bad Blood," which appears on her new album, 1989. "For years, I was never sure if we were friends or not. She would come up to me at awards shows and say something and walk away, and I would think, 'Are we friends, or did she just give me the harshest insult of my life?' Then last year, the other star crossed a line," Swift recalled. "She did something so horrible, I was like, 'Oh, we're just straight-up enemies.' And it wasn't even about a guy!" 
 
 Swift, who counts Lena Dunham and Karlie Kloss as BFFs, continued, "It had to do with business. She basically tried to sabotage an entire arena tour. She tried to hire a bunch of people out from under me." 
 
 For 15 months, Swift toured the globe to promote Red. Perry kicked off her Prismatic World Tour in May 2014, with concerts scheduled in Australia, France and the United States, among other countries. ||||| Katy Perry admitted that she hopes to finally end her long-simmering beef with Taylor Swift. "I'm ready to let it go. Absolutely, 100 percent," Perry said. 
 
 Related Katy Perry Vs. Taylor Swift: Pop Stars' Beef History Explained From stolen dancers to passive aggressive tweets, here's a look back at the source of the alleged "Bad Blood" 
 
 The singer's comments came during a conversation Saturday with Arianna Huffington that featured on Perry's weekend-long YouTube live stream session in support of her new album Witness. 
 
 "I forgive [Swift], and I'm sorry for anything I ever did, and I hope the same from her, and I think it's actually... I think it's time," Perry said of the feud (via Entertainment Tonight). 
 
 
 
 "There are bigger fish to fry, and there are bigger problems in the world. I love her and I want the best for her, and I think she's a fantastic songwriter, and like, I think that if we both, her and I, can be representatives of strong women that come together despite their differences, I think the whole world is going to go, like, 'Yeah, we can do this.'" 
 
 The singer's long feud – which reportedly began in 2012 when Perry poached Swift's backup dancers to join her own tour – resulted in songs like "Bad Blood" and Witness' "Swish Swish," but neither artist spoke about the beef until Perry recently opened up about the Swift rift. 
 
 "I'm not Buddha – things irritate me," Perry said in a recent interview. "I wish that I could turn the other cheek every single time, but I'm also not a pushover, you know? Especially when someone tries to assassinate my character with little girls. That's so messed up!" 
 
 The latest chapter in the feud came when Swift ended her years-long streaming service embargo the moment Perry's Witness was released digitally, a move that Swift's reps said was purely coincidence. 
 
 On Saturday, Perry seemed determined to end the pop stars' beef. "Maybe I don't agree with everything she does, and maybe she doesn't agree with everything I do, but like... I really, truly, want to come together, and in a place of love and forgiveness, and understanding and compassion," Perry said. 
 
 The pop star dedicated a portion of her live stream to airing a therapy session with Dr. Siri Singh, wherein she talked about dealing with depression and suicidal thoughts. "I feel ashamed that I would have those thoughts, feel that low and that depressed," Perry said in reference to the lyrics from her 2013 Prism ballad, "By the Grace of God." 
 
 "You can be right or you can be loved," she added. "I just want to be loved." 
 
 Perry got a visit from pal James Corden on Sunday, and the Carpool Karaoke host was able to get the pop star to open up on a different topic: her exes. In a game of "Spill Your Guts or Fill Your Guts," Corden gave Perry the option of either eating a thousand-year-old egg or ranking three of her exes based on their performance in bed. 
 
 After playing coy for a bit, Perry finally acquiesced, naming Diplo as the least impressive, Orlando Bloom as her second-place pick, and John Mayer as the top contender. "They're all amazing lovers and I would have sex with all of them after I got out of this place!" she made sure to note.
– Both Taylor Swift and Katy Perry have had difficult breakups with John Mayer, but Swift insists the story behind a vitriolic song on her upcoming 1989 album "wasn't even about a guy! It had to do with business," she says in an interview with Rolling Stone. Technically, "Bad Blood" might not even be about Katy Perry—Swift demurred from naming names when talking about the song—but by piecing together lyrical and situational clues, BuzzFeed claims "it's not hard to figure out who she's talking about." The song, which Swift tells Rolling Stone wasn't meant "to create some gossip-fest," talks about a fellow female performing artist who for years insulted and sabotaged Swift, including by "[trying] to hire a bunch of people out from under me" and "sabotage an entire arena tour," Swift says. BuzzFeed speculates she could be talking about three backup dancers who reportedly ditched Swift for Perry last year—and E! notes that Perry tweeted today, "Watch out for the Regina George in sheep's clothing...," a Mean Girls reference that could be a hint that Perry is indeed the song's subject. "For years, I was never sure if we were friends or not," Swift says in Rolling Stone of her unnamed colleague. "[Then] she did something so horrible. I was like, 'Oh, we're just straight-up enemies.'" As for why she wrote the song, Swift says, "I'm surprisingly non-confrontational—you would not believe how much I hate conflict. So now I have to avoid her. It's awkward." But, she adds, "Sometimes the lines in a song are lines you wish you could text-message somebody in real life. I would just be constantly writing all these zingers—like, 'Burn. That would really get her.'" The album is due out in October.