It seems like Katy Perry and John Mayer are taking their relationship to the next level: by going public at a friend’s pool party!

After a Chateau Marmont date, sleepover and hotel meeting, the pair put on some major PDA and were “all over each other” at a Hollywood Hills pool party over the weekend.

“There was major chemistry between them,” a source at the pool party on Saturday (August 4) shared. “He was looking down her bikini top, and they were French kissing really passionately. It was like they were on a honeymoon!”

The “Heartbreak Warfare” singer reportedly couldn’t keep his hands off of the colourful pop star, who wore a sexy metallic black and silver bikini.

“John and Katy were all over each other,” the partygoer added. “They were holding hands and kissing the entire time. Even in the pool, they stuck together nonstop.”

After spending a couple of hours hanging out with friends, the pair left hand in hand.