Usher has warned Justin Bieber not to ''f**k up'' his success.
The 'Scream' hitmaker - who mentored the 19-year-old singer alongside his manager Scooter Braun in 2007 - is seen giving his protégé a few words of advice in a teaser for new 3D film, 'Believe'.
In the video clip, Usher says: ''When I first met you I told you, you could have all of this, if you believe in it. Now it's happened, don't f**k it up.''
Mentors are seen addressing the singer after his recent mischievous behaviour, telling him to ''stay humble'', try and be the best person he can be and not to ''fall off that wagon''.
The film, which is released in the US in December, also features footage of the singer on tour and words of encouragement from his mother Pattie.
She tells him: ''Justin, I'm so proud of you and you are turning into an amazing young man.''
Open Road Films, confirmed that his upcoming concert film and documentary, 'Believe', will officially hit cinemas on Christmas Day (25.12.13).
Directed by Jon Chu, who also directed Justin in his 2011 film, 'Never Say Never', the movie will include concert footage as well as a behind-the-scenes look at his life.
He said: ''I am so excited to be involved in this movie, and so happy to be able to give back to my fans, especially during the holiday season.''