Justin Bieber At 18

Justin Bieber, a worldwide star at the age of just 15, turned 18 on March 1 2012.

What is his life like, now that he has reached such a big milestone?

Will his success continue as an adult?

Is marriage now on the horizon, with girlfriend Selena Gomez?

The answers to all these questions, and many more, are in this fascinating look behind the headlines.