Zac Efron is stepping on Rob Pattinson’s turf! Zefron was spotted out with pals on Friday night to Opus Bar, a Vancouver hot spot popular with Pattz & Co. when they were in town shooting “New Moon.” And clearly, Zac didn’t mind being seen…

“Opus Bar is a very see-and-be-seen scene,” a source tells us. “Zac was offered a private room but seemed content to stay in the main bar along with other guests.” The source continues, “He was approached by other bar customers who were excited to see him in the flesh, and he was friendly with fans.”

The 21-year-old heartthrob, who is in Canada filming the drama “The Death and Life of Charlie St. Cloud,” certainly didn’t let the absence of gal-pal Vanessa Hudgens stop him from partying the night away for two-and-a-half hours. The group (Zac, plus three guys and a gal) downed the house specialty Cherry Salome Sour cocktails, along with Belvedere and sodas, finishing off with rounds of SKYY Vodka shots, according to the source. [Source]