Katy Perry and Robert Pattinson have "serious chemistry".

The stars have been spotted together several times in the past few months, with Katy said to be helping Robert get over his split from Kristen Stewart. They partied at the Coachella music festival and even reportedly crashed a wedding rehearsal together.

"Katy and Robert have been spending a lot of time together recently and it's safe to say there is serious chemistry," a source told British magazine Grazia.

It has been claimed that over the weekend they attended the wedding rehearsal, they had travelled to Katy’s hometown of Santa Barbara, California, to meet her parents.

It seems the singer could be developing real feelings for Robert after deciding she wanted him to meet her mom and dad.

"Katy thought the break from LA would do Rob good, and since he was no longer living with Kristen, she didn't hesitate in inviting him to join her," the source added.

Although Katy loves spending time with the Twilight hunk, she doesn't want a serious romance at the moment.

The 28-year-old has been in an on-off romance with musician John Mayer and is divorced from British comic Russell Brand following a whirlwind relationship.

"Katy doesn't want to ruin their friendship by rushing into anything," the source explained. "Rob really likes Katy. There's always been a bit of a spark between them."

Robert is believed to have split from Kristen last month and has moved his things out of their shared home. According to reports, the Twilight stars struggled to move on after Kristen was unfaithful last year with married director Rupert Sanders.