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

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

This year, 13 reasons why actor and longtime brand ambassador stars in Calvin Klein’s new Holiday 23 campaign, rooted in the celebration of giving.

The new spot, photographed by James Brodribb, also stars fellow ambassador Hailey Bieber, who models a slew of festive outfits from Calvin Klein’s holiday collection, from a sexy jumpsuit to a fiery red miniskirt.

Brandon Flynn for Calvin Klein.

Alithea Castillo and Kim Tin

Hailey Bieber stars in Calvin Klein’s holiday campaign — an exclusive behind-the-scenes look

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

The standout monochromatic underwear comes in four different colors, but Flynn stays classic in his maroon pair.

Brandon Flynn for Calvin Klein.

Alithea Castillo and Kim Tin

In the BTS pics, Flynn flaunts his toned physique — including his chiseled abs — and shows off his collection of tattoos.

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

Brandon Flynn for Calvin Klein.

Alithea Castillo and Kim Tin

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PEOPLE recently caught up with the actor in his current fashion style, and he revealed the three items he wears to feel most like himself: Speedos, jeans, and a t-shirt, with the second and third worn together. In short, he’s a classic guy when it comes to style.

Luckily, Calvin Klein has all three and much more in its Holiday Collection, available for purchase online at calvinklein.com.

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Source: HIS Education