It's no secret that Rob Pattinson and Katy Perry are friends, but based on new reports, it sounds like their relationship was one of the contributing factors to Rob's latest split from Kristen Stewart!

Earlier this month the duo were spotted at the Daughter concert at the Bowery in New York, and apparently K. Stew was NOT happy about that outing. And just this past weekend, the pals were spotted together again, this time at a wedding rehearsal at San Ysidro Ranch, near where Katy grew up.

Rehearsal guest Stephanie Sands told People, "Katy and Rob were just sitting next to each other watching the wedding rehearsal in the main courtyard area. They were dressed very casually ... 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."

Sounds innocent enough, but apparently Katy has made it clear to Rob that she thinks he deserves better. A source told Life & Style that Perry was never a fan of the reconciliation. "Katy never really supported Rob's decision to get back with Kristen," the insider said. "She always said they wouldn't last. Katy told Rob she didn't think their relationship could withstand the cheating scandal. And he deserved better than someone who would destroy a family [like Rupert's]."

No wonder K. Stew didn't like them hanging out!