Katy Perry - Katy Perry Attends House Party With Beau John Mayer

According to the UK's Sun newspaper, Katy had spent the day at a water park in Los Angeles - where she suffered an embarrassing wardrobe malfunction - before meeting up with John for the evening. It was the latest in a string of dates for the musical duo, which follows Perry's disastrous marriage to British comedian Russell Brand. The singer is the latest of Mayer's celebrity dalliances, after brief romances with Jennifer Aniston, Taylor Swift and Jessica Simpson. Meanwhile, Russell Brand is said to be dating Isabella Brewster, after meeting her at a yoga class in Los Angeles. Just last week, the couple were seen on a date in London as the comedian showed his new girl around his hometown.

Katy Perry and John Mayer first sparked dating rumors when they were seen leaving celebrity hot-spot Chateau Marmont together on August 1, 2012, where they had reportedly had a dinner date.