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Justin Bieber

YouTube

Justin Bieber has grown.

The 19-year-old pop star has been getting ripped and showing off his bulging biceps, along with cruising the streets in extra-fancy cars, but those things aren't what make Biebs a man. According to the singer and his manager Scooter Braun, it's all about his facial hair.

In honor of #FilmFridays (to go with #MusicMondays), Bieber released a funny sneak peek clip titled "#Stache" from of his upcoming Believe movie.

"Speaking of grown men, I'm drinking coffee right now," J.B. joked in the video.

"I keep my promises. U got to #1 so I owe u ....," Bieber tweeted. "Here is your first . The lol - see u Sunday at Midnight."

His mentor, Usher, said, "As a 19-year-old, Justin is now becoming his own man." Meanwhile, Bieber's mom, Pattie Mallette, added, "I think it's hard for parents to let go, but I think that it's really exciting, too, to see him maturing."

And that's when the pop star faked going down a flight of stairs behind a countertop (LOL!).

Believe hits theaters Christmas Day.

Justin Bieber

YouTube