Katy Perry and John Mayer are moving hella fast with their relationship.

The pair reportedly spent last Saturday (August 4th) at a friend's pool party in the Hollywood Hills and literally could not keep their hands off one another.

"There was major chemistry between them,” a source at the party says. “He was looking down her bikini top, and they were French kissing really passionately. It was like they were on a honeymoon! John and Katy were all over each other. They were holding hands and kissing the entire time. Even in the pool, they stuck together nonstop.”

There are supposedly pictures of this in the next issue of Star, which should be hitting the web soon. So we'll see what's really up when that happens.

[via Radar Online]