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29 May 2013, 10:33
The 'Teenage Dream' star invited the US singer-songwriter round for a party with friends.
Katy Perry has sparked rumours she and John Mayer are back together after the two were spotted at a barbecue party this week.
Katy held a party at her new Los Angeles home in the Hollywood Hills on Monday (27th May) and is believed to have invited John to attend alongside her friends, where the two were said to be "very flirty".
"They seem to be back together, or back together-ish," a source told Us Magazine after the party. "They were very flirty and having a really good time together.
"They have good chemistry," the source continued, while another added: "They were definitely friendly."
Check out a picture of Katy Perry and John Mayer out together earlier this year below:
Katy, who divorced husband Russell Brand in July last year, is currently working on her third studio album and was rumoured to be writing a song about her break-up from singer-songwriter John Mayer.
Katy Perry has also been linked to Hollywood superstar Gerard Butler in recent weeks.