Justin Bieber Writes a Romantic Song For His Girlfriend

Justin Bieber has written a love song for his girlfriend Selena Gomez.

The Boyfriend singer played the song to Will.i.am on a flight from L.A. to Toronto.

Bieber has been dating the Disney Channel star for 18 months.

Will.i.am and Justin are good friends and have worked together in the past

Will.i.am was treated to a rendition of the tune on the short haul flight.

"The song was dope.

"He was like, 'Yeah, I wrote it for Selena.' It's great. And it was really awesome. It was really, really dope," said The Voice UK judge.

"As a producer, it makes me proud that someone wants to get into producing and taking that craft to become a songwriter and producer.

"I think that guy is going to be around for a really long time," he said.

Beiber seems to be a die-hard romantic and last week treated his girlfriend to an idyllic dinner after the Teen Choice Awards.