AceShowbiz -

Katy Perry and Robert Pattinson were spotted hanging out together at Bjork's concert on Saturday, June 8, at the Hollywood Palladium in Los Angeles. According to X17Online, the pair arrived at the concert venue separately at 7:30 P.M. but they met up inside.

"They had planned to meet up before going inside to the concert. They must have been coordination on their cells phones because they pulled up next to each other in the parking lot, rolled down the windows and were talking. They parked and then met at the door and went inside together," a photographer told the site.

Katy and Robert were together throughout the show, but they left the venue separately to avoid paparazzi. The photographer explained, "Katy came out the back door by herself, trying not to be noticed. She was looking around to see if there were any photographers. She definitely didn't want to be shot with Rob."

Katy apparently became a shoulder to lean on after Robert broke up with Kristen Stewart last month. The two were even spotted crashing a wedding rehearsal at the San Ysidro Ranch in Montecito, California in the end of May. According to a guest at the event, "Katy and Rob were just sitting next to each other watching the wedding rehearsal in the main courtyard area." Another guest added that "there was no PDA between them and no body language that showed they were dating. They just sat together and watched."

Katy was recently rumored going back with her ex-boyfriend John Mayer after the two singers reunited at a barbeque party in her house during memorial day. "They seem to be back together - or back together-ish," a guest at the party told Us Weekly. Another guest, however, said that the two were "just hanging out."