Zac Efron took his sober coach to the Oscars.

The 26-year-old actor underwent a stint in rehab early last year, allegedly because abusing alcohol and painkiller Oxycodone, and ensured he wasn't tempted at Sunday's (02.03.14) glitzy extravaganza by having his companion by his side at the Dolby Theater in Hollywood.

A source told ''Zac had a sober coach with him the entire time he was at Dolby to monitor what he was doing and to make sure he didn't partake in any substances like drugs or alcohol.

''The coach was there to escort him to the bathroom or backstage, anywhere he needed to be where temptation might arise.''

The 'That Awkward Moment' actor - who was seen wearing a blue Alcoholics Anonymous (AA) chip, marking six months of sobriety in December - is said to have skipped the afterparties in favour of a quiet night back at home.

Zac recently proclaimed he is feeling better than ever after his stint in rehab.

He said: ''I'm so happy. I feel like I'm in a great place and I'm glad that I'm really here to share this moment with everybody and be present for all of it.

''It was an interesting year. I learned so many things. So much. The best part of it was being able to reflect upon that experience and realise how much I have learned about myself and the kind of man I want to be.''