Zac Efron is dating Halston Sage. The 26-year-old actor, who sought treatment in rehab for cocaine addiction twice last year, began dating his Bad Neighbors
co-star after meeting her on the set of the upcoming comedy. A source told E! News: ''They are definitely an item. They were seeing each other a bit during 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.'' The heartthrob, who previously dated Vanessa Hudgens and Lily Collins, and the 20-year-old former Nickelodeon star were photographed laughing and talking animatedly as they watched a Los Angeles Lakers basketball game together earlier this month.