Justin Bieber

Justin Bieber is proving he's a "Baby" no more.

In the video for his upcoming single "All That Matters," the 19-year-old singer gets hot and heavy with model Cailin Russo. The clip features the two kissing, touching and grinding.

See photos of Justin Bieber through the years

The single, which was released on Oct. 14, is part of his "Music Mondays" series, in which Bieber unveils a new song every Monday. The venture is to promote his new film, Believe 3D, which hit theaters on Christmas.

Watch the video below:

What do you think of grown-up Bieber?