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 thru..." he posted.