The 'California Gurls' singer, who was romantically linked last month with French model Baptiste Giabiconi, was seen hugging and kissing Florence + the Machine guitarist Ackroyd during the second weekend of the music and arts festival in Indio.
Life & Style recently reported that the 27-year-old star was overheard referring to Ackroyd as her "boyfriend" backstage at the festival, with a source telling the US publication: "At the Artist Lounge at Coachella last weekend, Katy kept saying her boyfriend was the guitar player for Florence + the Machine.
"She and a bunch of friends were supposed to go see Dr Dre together, but Katy said she was waiting to watch her boyfriend perform."
Other stars at the festival over the weekend included Twilight actor Robert Pattinson, Hollywood starlet Emma Roberts, Gossip Girl's Penn Badgley and girlfriend Zoe Kravitz, and Dita Von Teese.
> Katy Perry, Lindsay Lohan, Radiohead: Coachella 2012 in pictures
Flick through our gallery of Katy Perry, Robert Ackroyd and others at Coachella below: