The 'As Long As You Love Me' hitmaker was reportedly spotted offering acting tips to the '17 Again' star, 28, when they partied at Efron's home in Los Angeles earlier this week.
A source told Us Weekly magazine: ''[Justin told Zac] to be more selective about the roles he takes. Justin was very honest and kind of went in on Zac but Zac appreciated it.
''Zac told Justin to keep breaking boundaries. He was giving him life tips.''
Meanwhile, 22-year-old Justin has also been giving Kylie Jenner advice on how to cope with fame at a young age.
She shared recently: ''I'm so close to him because I feel like he's been through exactly what I've been through in a completely different way but very similar.
''He gets me, and every time I see him he always sits me down and is like, 'Are you OK? You're amazing. You can get through this, just stay true to yourself.' He helps me a lot.''
And Justin is equally happy to receive advice, after it was previously revealed he got tips on making a comeback from Kanye West.
He said: ''Out of anyone in the industry who is creative and I see eye to eye with, he really gets me. His advice is always just, 'make music that's so good people can't hate on it'. I didn't wanna bore him or waste his time. So I was like, 'Can I play you these songs?' and he was like, 'I wanna hear everything.' To hear him say that, it stuck with me. It just showed that he cared.''
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