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It's been a weird year for Zac Efron, what with breaking his jaw on a mysterious puddle of water, getting into a late-night fight while driving through a sketchy part of Los Angeles and getting treatment for a suspected substance problem.

But with a new movie to promote ("Neighbors" with Seth Rogen, in theaters May 9), it seems his image cleanup has begun in earnest, starting with his shirtless, golden-muscled appearance at Sunday's MTV Movie Awards and segueing into a conveniently timed report of a new romance.

E! News says Efron, 26, is currently seeing his "Neighbors" co-star Halston Sage, who joined him in courtside seats at a Los Angeles Lakers game on April 4. Sage, 20, seems to have a weakness for pretty dreamboat types: She recently broke up with fellow distinct moniker carrier Chord Overstreet.

"They are definitely an item," a source assures E!. "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."

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