Robert Pattinson Spotted With Katy Perry, Justin Bieber & Selena Gomez at 'Part of Me' Afterparty!

In a rare turn of events, Robert Pattinson left his love, Kristen Stewart, at home last night and went to party with... Katy Perry? Yup, that's right!

The Twilight Saga star was spotted partying with not only Katy, but her pop star pals Justin Bieber and Selena Gomez following the premiere of Katy's new 3D documentary, Katy Perry: Part of Me, in Los Angeles. The group huddled in Justin's $200,000 custom-made Mercedes minivan before checking out the opening of the Bootsy Bellows nightclub on Sunset Boulevard in West Hollywood.

OK! GALLERY: KRISTEN STEWART & ROBERT PATTINSON REUNITE AT A MUSIC CLUB IN L.A.

Reportedly, this interesting mix of celebs met at the Chateau Marmont following the premiere and decided to party to the wee hours of the morning. (Ugh, KStew missed out!) 

We know Rob likes a good party, so it's no wonder he joined Katy for some fun while enjoying a little down time from his usually hectic career.

OK! NEWS: KRISTEN STEWART & ROBERT PATTINSON PARTY WITH ZAC EFRON & ANDREW GARFIELD AT A WEDDING IN N.J.!

Plus, Justin has said in the past that RPatz would make the perfect "wingman!"

"My ideal wingman would be Robert Pattinson," Justin told OK! UK. "We should go to a few showbiz parties and see what happens." Well Biebs, your wish came true!