Justin Bieber being a normal teen - Will Smith

Will Smith has defended Justin Bieber.

While Justin Bieber has recently received criticism for arriving on stage two hours late for the first of his London shows and threatening a photographer, Smith insists he is simply being a normal teenager.

He told Extra: "When somebody is 19 years old, they're gonna do what they're gonna do, just like we did."

Smith - whose son Jaden, 14, is close friends with Bieber - also revealed he has offered Bieber advice and is available whenever he needs someone to talk to.

He added: "For me, the most important thing was for him to know anytime he can just call and I'll come, whatever happens. At that age, that's what you need, to know you can do what you're gonna do, but you have somewhere you can go, where you can find safety."

Smith added, "It's hugely important to support artists, young artists specifically. There is a war against that kind of artistry, that kind of creation."