Justin Bieber couldn't believe his luck when he bagged triple threat Selena Gomez as his girlfriend, but he has revealed that he was seeing someone else when they first met. 

The Canadian teen sensation explained to Fanatic FM that the pair started out as friends, but their relationship kept evolving and he couldn't be happier with how things have turned out:

"I was pretty shocked myself. She's very beautiful. We started as friends like two years ago, so we've been friends for a long time, so that's pretty much kind of how it started."

"I had a girlfriend when Selena was my friend. I think we should be talking about sports."

Watch Bieber's live collaboration with Taylor Swift here: