Pop music's bad boy, Justin Bieber, is not ashamed of his new mustache

According to US Weekly, the Beauty and a Beat singer joked about his look on Twitter and said, "I keep my promises, U got #heartbreaker to #1 so I owe u #filmfridays...Here is your first #filmfridays. The #stache lol." He then released a sneak peek of his upcoming movie Believe 3D movie, set to hit theaters on Christmas Day. In the opening clip, Bieber is seen joking about his "stache." He said, "That's how much of a man I am...#Stache...Speaking of grown men, I'm drinking coffee right now," after his manager Scooter Braun made fun it. He first debuted his stubble at New York Fashion Week last month.

The movie is a sequel to his Never Say Never film that was released in Feburary 2011 and featured raw footage from Bieber's childhood days as well as his 2010 concert tour.He steps it up a notch for Believe and reveals what it was like to transition from a teen pop star to an adult. In the teaser he released, his mom, Pattie Mallette, speaks on how she feels about Justin being all grown up.

"I think it's hard for parents to let go but it's really exciting."

R&B sensation Usher also said, "As a 19 year-old Justin is now becoming his own man." Usher signed Bieber in 2009 when he was just 15.

Fans will also get to see a lighter, goofier side of Bieber who jokes around with his friend and management team throughout the film.

Take a look at the first official trailer!

Tags: Justin Bieber