Katy Perry and Robert Pattinson spent their Memorial Day weekend crashing weddings together, appearing at a wedding rehearsal in San Ysidro Ranch hotel in Montecito, California.

Perry and Pattinson showed up at a wedding rehearsal “dressed very casually” and sans PDA, according to a guest at the ceremony, Huffington Post reports. The superstar pair did not attempt to cause a riot, sitting together quietly in the courtyard and watching the proceedings. The guest of the bride and groom who spotted the pop singer and the dreamy vampire said she did not know why the two were present.

"They were not affiliated with the wedding party and were not seen mingling with guests," the guest, Stephanie Sands, explained. Sands tweeted about the star spotting in a photo of her and her friend, the bride.

The appearance of the superstars was “extra exciting” for the bride and groom though the family members opted to “respect their privacy”, a relative told People Magazine . The wedding was an “all inclusive” Jewish-Catholic-Hindu ceremony.

This is not the first time the pair appeared out together. Both recently split from longtime lovers, Pattinson from Twilight co-star Kristen Stewart, and Perry from rocker John Mayer. Rumors have run rampant that Perry contributed to Pattinson and Stewart’s most recent split, but other sources indicate that Perry, who went through a turbulent divorce from Russell Brand, is simply a friend allowing Pattinson to vent his frustrations.

Image: NBC Universal