John Mayer, who?
The pair both attended the Jeremy Scott-Adidas party on Saturday night, where a eyewitness says the two were "definitely flirting" and acting like more than just friends.
However, another source close to Katy insists that she and Diplo are simply "good friends" and says this isn't a blossoming romance.
According to reports, the 29-year-old pop star and the 35-year-old producer were also spotted together backstage during the annual three-day outdoor concert.
An eyewitness told Page Six, "Katy and Diplo hooked up at Coachella. They were together behind the main stage, where she had a tour bus or trailer, and a group of her friends were hanging out." The insider added, "It was very obvious that Katy and Diplo were together. They seemed inseparable and at one point they were seen getting onto her bus together."
In addition to partying with Diplo, Perry also hung with pal Robert Pattinson at the H&M Loves Music Party, where an eyewitness said the two clearly had a good time together, adding that they looked like good friends just having a great time while dancing and laughing in the VIP area.
This isn't the first time the "Roar" singer has found love at Coachella. She previously dated Florence + the Machine guitarist Robert Ackroyd and was seen holding hands and kissing musician at the music festival, shortly after filing for divorce from her former husband Russell Brand.
As for how Perry's feeling post-split? A source recently told E! News that the "Dark Horse" beauty is "doing really good," adding that "she is in great spirits right now."
According to multiple sources, Perry is still very much single and is not currently talking to Mayer. "Katy is focused on her tour right now," the source dished. "She is not allowing anything to distract her from it."
Well, with the exception of a fun weekend at Coachella.
—Reporting by Baker Machado and Sara Kitnick