Zac Efron's new girlfriend revealed: actor dating Neighbors co-star

Sorry ladies, Zac Efron is off the market. The actor, who caused a stir when he showed off his sculpted abs at the MTV Movie Awards on Sunday, is dating his Neighbors co-star Halston Sage.

"They're definitely an item," a source exclusively told E! News. "They were seeing each other a bit during the filming of their movie together and ever since he went to rehab they got a lot closer. Her friends love him and say he is so sweet. He's really good to her."

Zac is reportedly dating his Neighbors co-star Halston Sage

Earlier this month, Zac, 26, and Halston, 20, were pictured together as they cheered on the LA Lakers from their courtside seats. Less than a week later, Halston and her boyfriend, Glee star Chord Overstreeet, confirmed the end of their romance.

The hot new couple are yet to make their debut. Zac decided to take LaQuishe Wright, the social media manager for Neighbors, along as his date for Sunday's ceremony.

Halston has previously dated Glee star Chord Overstreet

The handsome star managed to steal the show when Rita Ora unbuttoned his short to reveal his ripped torso as he arrived on stage to collect the award for Best Shirtless Performance.

It was a welcome return to the spotlight for Zac. Just last month, he was attacked in the Skid Row area of LA after he and his bodyguard became embroiled in a fight with local residents while waiting for a two truck.

Rita Ora ripped off Zac's shirt at Sunday night's MTV movie awards to reveal his impressive torso

The 17 Again actor is said to have thrown a bottle out of car window, aggravating residents — and two men attacked Zac's bodyguard before hitting the 26-year-old in the face.

"It was the hardest I've ever been hit in my life," Zac later told TMZ.

The incident came four months after the star broke his jaw after slipping over at his LA home.

"Hey guys! Just returned from an incredible trip to Peru with my dad and wanted to thank you all for your support these past few weeks...means the world to me. Love you guys! - Z"

In September, it was revealed that Zac had completed a stint in rehab earlier in 2013. Sources said that after ascending to A-list status following the success of the second High School Musical film, he fell in with the wrong crowd.

Later in September, Zac broke his silence for the first time since news of his attempt to get help became public knowledge.

Posting an Instagram picture of himself at the Machu Picchu mouton ruins in Peru, he wrote in the caption, "Hey guys! Just returned from an incredible trip to Peru with my dad and wanted to thank you all for your support these past few weeks… means the world to me. Love you guys — Z."