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Justin Bieber Flashes Washboard Abs As Newest Calvin Klein Underwear Model

Well, that explains the saggy jeans: Justin Bieber is the latest celebrity male model for Calvin Klein underwear, following in the storied boxer briefs of Antonio Sabato, Jr., Kellan Lutz and, of course, and Mark Wahlberg. On Tuesday the 20-year-old pop singer flashed his toned abs, glutes and package in a series of black-and-white photos for the designer's iconic line of skivvies.

Related: Calvin Klein Model Garrett Neff Makes Us Laugh, Swoon

In an accompanying promo video, Bieber is show drumming and then pulling in Dutch model Lara Stone for a kiss. (At 31, Stone is old enough to be his Mrs. Robinson).

"Officially a part of the legacy," Bieber posted on social media. "Check out @calvinklein for more. #mycalvins. #newfaceofcalvinklein"

The "Boyfriend" singer gave Beliebers a sneak preview in September at Fashion Rocks, where he stripped down to a pair of red-and-black Calvins.

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