Justin Bieber's all grown up in new music video

In case you've missed the memo, Justin Bieber's no longer a little kid with an impressive haircut.

No, these days he's an R&B-pop lothario with abs that apparently don't really get along with shirts - or at least, that's the impression we got from Bieber's new music video.

The 19-year-old has unveiled a clip for one the singles he released as part of his Music Mondays series, "All That Matters." Over the course of three-and-a-half softly lit minutes, Biebs and his on-screen love - portrayed by model Cailin Russo - adopt a variety of stereotypical sultry poses, and of course get in a little making out.

[youtube=http://www.youtube.com/watch?v=JC2yu2a9sHk&w=450&h=360]

"All That Matters," which was released on October 14, is the first song from Bieber's "Music Mondays" to get an accompanying video. The artist has one more song to go - following December 2's release, "Change Me" - before the end of the series.