Is Robert Pattinson Cheating on Kristen Stewart?

Now that the Twilight films have wrapped, are Robert Pattinson and Kristen Stewart history as a couple? If not, Rob may have some explaining to do.

OK! NEWS: ROBERT PATTINSON & KRISTEN STEWART ARE HOLLYWOOD'S BEST ACTORS FOR THE BUCK

He left a Los Feliz, Calif., bar on Dec. 4 with Kristen's Cutlass co-star Sarah Roemer while K-Stew was in the U.K. finishing Snow White and the Huntman.

OK! NEWS: ROBERT PATTINSON TO TAYLOR LAUTNER — STAY AWAY FROM KRISTEN STEWART

Bearded and under a cap, Rob ducked into a waiting car — with Sarah in the backseat — and put his hand on hers as they drove to Soho House in West Hollywood.

FOR MORE OF ROBERT PATTINSON SEXY NIGHT WITH KRISTEN'S CO-STAR & TO SEE THE PHOTOS, PICK UP THE NEW ISSUE OF OK! — ON STANDS NOW!