Zac Efron's rehab stint is reportedly over but speculations that he's back on drugs surfaced when the 'Neighbors' actor got involved in a physical assault in the Skid Row area of Los Angeles, California. Despite his alibi, his friends think that he was looking for something else in the area that is notoriously known for having substance suppliers.

Apart from his fans, Zac Efron's rehab reason likewise worries Lea Michele who lost her boyfriend Cory Monteith because of substance abuse. The 'Glee' actress is reportedly worried, that's why she has been reaching out to Efron hoping that he will seek help again.

Lea Michele and Cory Monteith's relationship ended when the latter died in July 2013: "After he died, Lea became a sober support for Zac. She'd even invite him on hikes through Runyon Canyon. But lately, Zac's been standing her up. She's deeply worried that Zac is teetering on the brink of tragedy."

The 'Cannonball' lyrics singer reportedly wants the 'High School Musical' actor to admit about his relapse and enter a "hard-core rehab program." Even Efron's ex-girlfriend Vanessa Hudgens is reportedly worried about him.

The two dated for five years and parted ways in 2010 allegedly because of Efron's drug use: "Vanessa is just not that kind of girl. There's no way she's into drugs. She wants a stable, no-nonsense, no-drama guy, which is what she has with Austin."

Even if Hudgens is already happy with her relationship with Austin Butler, the Showbiz Spy source claims that it won't stop her from worrying that Efron might end up like Monteith: "But she still cared about Zac. They were together for five years, and practically grew up together. She has minimal contact with him these days, but has tried reaching out to him this week to find out what's going on. She hasn't been able to speak to him, though."

Efron is reportedly being coached by his former 'Hairspray' director Adam Shankman. The director is allegedly urging the 'Safe Haven' actor to have the same treatment program that he once signed up for.