Zac Efron and Robert Pattinson have become good friends - enjoying a night out in Sunset Boulevard.

The pair were spotted at hot spot Bootsy Bellows on the guys' night out in LA, E! News reported.

A source said the duo hung out with friends in the venue's VIP room having first been to the Pinz Bowling Alley in Studio City, California.

"Rob and Zac both looked good and happy. Rob showed Zac something on his cell phone and they both started laughing. They were in really good moods," E News quoted a source as saying.

Zac has been dating Michelle Rodriguez while Twilight heartthrob R-Patz is currently single.

The duo were also seen at the Chateau Marmont on Saturday night, along with Michelle.