Did Zac Efron secretly go to rehab?

Fans were shocked when news broke in September that Zac Efron had secretly completed not one, but two stints in rehab in March and April 2013 after privately struggling with substance abuse for years. Fortunately, a source close to the actor says that, thanks to treatment, Zac is now clean and sober. "He's taking care of himself and it shows," the source says. "He's happy, healthy and taking time to focus on working." As he gets his life back on track, Zac is super grateful for his fans' encouragement. "Wanted to thank you for your support these past few weeks... means the world to me," he tweeted. "Love you guys!"