Robert Pattinson and Katy Perry Hook Up For a Concert in LA

Katy Perry and Robert Pattinson met up for a Björk concert at the Hollywood Palladium on Saturday night. According to a source, both stars came in together for the show but left separately — Katy headed out the back entrance, while Rob snuck around to smoke a cigarette with a pal. Katy invited a group of friends, including Rob, to her LA home after the concert, and the party reportedly went well into the night.

Katy and Rob's close friendship has long ignited dating rumors, especially now that both stars are currently single. Robert split from girlfriend Kristen Stewart late last month, and though Katy called it quits with John Mayer back in March, the two were seen spending time with a group of mutual friends in LA over the weekend. Robert and Kristen each seem to be keeping busy since their recent breakup and spending lots of time with friends — Kristen was spotted looking smiley and happy with a group of girlfriends over the weekend while running errands and dining at a sushi restaurant.