Pop star/bad boy Justin Bieber has officially stepped into grown man territory with the announcement of him being the new face of Calvin Klein underwear.  He joins a very exclusive list of hotties (Antonio Sabado Jr. and Mark Walberg) that have made hearts everywhere skip a beat.

Check out the Beebs sculpted body, with model Lara Stone, poured into those boxer briefs that snug in all the right places. hmmmm we think Nick Jonas has some competition!

Photography by Mert and Marcus.