Los Angeles: Teen sensation Justin Bieber is reportedly collaborating with pop star Kesha in one of his new songs.

The joint track is to be recorded for his next studio instalment 'Believe' and is written by Kesha herself, Ace Showbiz reported.

Bieber, 17, who has been busy in studio working with his collaborators, posted a picture on Twitter on February 2 of him and Weezy.

"Good time in the studio last night. Back at it tonight. oh yeah... and big bro came through..." he posted.

(Agencies)