Justin Timberlake's parents encouraged him to put in ''115 percent'' when working.

The 33-year-old pop star and actor, who rose to fame began his career as part of boy band 'N Sync, before becoming a successful solo star, credits his mother and father for teaching him the importance of hard work.

Speaking to Oprah Winfrey for her Oprah's Master Class series, Justin said: ''That was something I remember my parents telling me. The idea that if you put in more than 100 percent, if you put in 115 percent, then there's a good chance that you're going to end up getting back somewhere in the 90's. That made sense to me.''

Justin practiced singing and dancing growing up for hours on end and only performed live when he felt ready to face an audience.

He continued: ''And the idea that something worth having was worth putting all of yourself into it. Practice, rehearsal, working on it when no one's looking.

''Getting comfortable in it. So that when you step on that stage, you're ready. And then you can literally forget all of that and just be in the moment. And do something different. Do something original, do something different every time.''

Meanwhile, Justin appears on Michael Jackson's posthumous album, 'Xscape', which was released last week and revealed it was Michael who made him believe he could go solo.