Get an Exclusive BTS Look at Brandon Flynn's Nearly Naked Photo Shoot (Including His Abs!) for Calvin Klein

Flynn stars alongside Hailey Bieber in the brand's new holiday campaign

All Brandon Flynn needs this holiday season is his Calvin Klein underwear.

This year, the 13 Reasons Why actor and longtime ambassador of the brand stars in Calvin Klein's new Holiday 23 campaign, rooted in the celebration of gift giving.

The new spot, photographed by James Brodribb, also stars fellow ambassador Hailey Bieber, who models a rack-worth of festive outfits pulled from Calvin Klein's holiday collection, from sexy slips to a fiery red minidress.

Related: Hailey Bieber Stars in Calvin Klein's Holiday Campaign — Get an Exclusive Look Behind the Scenes

In exclusive behind-the-scenes photos shared with PEOPLE, Flynn, 30, reveals what's underneath his holiday-wear, including a tight pair of briefs (CK's Future Shift Holiday Low Rise Trunks to be exact) — and nothing else!

The featured monochromatic undies come in four different colors, but Flynn keeps it classic in his maroon pair.

In the BTS pictures, Flynn flaunts his toned physique — including his chiseled abs — and showcases his collection of tattoos.

To make things even hotter, he shows off his best heartthrob poses, from the swoon-worthy muscles to the seductive lip bite. Basically, Flynn is the full package and the gift that keeps on giving this holiday season.

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PEOPLE recently caught up with the actor on his current style M.O. and he revealed the three clothing items he wears to make him feel most like himself: Speedos, jeans and a T-shirt, and he wears the second and third together. In short, he's a classic kinda guy when it comes to style.

Thankfully, Calvin Klein has all three and much more under its Holiday collection, available to shop online at calvinklein.com.

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Read the original article on People.