Zac Efron wears his sobriety chip at a Lakers' game on Dec. 20, 2013. Credit: Noel Vasquez/Getty Images

He may have his head in the game, but fans were focused on what was hanging around Zac Efron's neck at a Laker's basketball game on Dec. 20. The former High School Musical star wore his blue AA sobriety chip around his neck while cheering for the Los Angeles team. 

The blue chip implies that Efron, 26, is six months sober. The actor secretly completed a rehab stint in April 2013, which he managed to keep quiet for five months. 

Efron seems to be keeping busy post-rehab. His film That Awkward Moment hits theaters on Jan. 31, 2014. The former child star broke his jaw in November after a fall at home and had his mouth wired shut. 

But it seems to have healed, and on Dec. 15 he was all smiles at a Colts game while posing with Colts player Matt Overton.