Their attendance at a Bjork concert is the latest fuel for rumors that singer Katy Perry and actor Robert Pattinson are in a relationship.

According to website x17Online.com (via The Daily Mail), the pair were seen at the Icelandic singer's show at the Hollywood Palladium on June 8. They allegedly met up "discreetly" and left separately in order to avoid being snapped together by photographers.

Perry's wore all black to the concert - a leather mini-skirt, a T-shirt with a black and gold crufix on it, a long shiny coat and studded heels. The outfit matched her solid black hair. After the show, the singer took to Twitter to gush over Bjork's performance.

"Dear Bjork, how do I join your traveling girl cult? #brilliantshow," wrote Perry.

The concert was another in a series of events the singer and the actor have attended together recently. Rumors have persisted that they are a couple, even with insistence from some sources that they are still just friends.

The singer is even said to have brought Pattinson to visit with her parents in Santa Barbara.

"Katy and Robert have been spending a lot of time together recently," a source told the British magazine Grazia, "and it's safe to say there is serious chemistry. Katy thought the break from L.A. would do Rob good, and since he was no longer living with Kristen, she didn't hesitate in inviting him to join her.

"But she doesn't want to ruin their friendship by rushing into anything."

The casual nature of Perry and Pattinson's relationship was also visible when they stopped by a wedding on Memorial Day weekend at the San Ysidro Ranch, near Perry's hometown.

"Katy and Rob were just sitting next to each other watching the wedding rehearsal in the main courtyard area. They were dressed very casually," rehearsal attendee Stephanie Sands told People. "She was wearing a hoodie and big sunglasses. There was no PDA between them and no body language that showed they were dating. They just sat together and watched. They were not affiliated with the wedding party and were not seen mingling with guests."

Pattinson and his ex-girlfriend Kristen Stewart broke up in May after Pattinson was seen moving his belongings out of her Los Feliz house. Perry and her ex-boyfriend, singer John Mayer, broke up in March. Recent reports suggested that the latter two rekindled their relationship at a Memorial Day party Perry hosted.

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Katy Perry, Robert Pattinson