The actor has been signed up as the face of the designer label's X range.
‘I started out modelling so this is the pinnacle,' Kellan, 24, tells People.
‘What more can you do than be on a billboard for something that you grew up thinking was super sexy and classy? It's really prestigious and I love it.'
The black and white images of Kellan - shot by photographer Mikael Jansson - will appear worldwide on billboards and magazines from March.
Actor Mehcad Brooks, Spanish tennis star Fernando Verdasco and Japanese footballer Hidetoshi Nakata have also been signed up for the X campaign.
Mark Wahlberg and Djimon Hounsou have previously modelled Calvin Klein Underwear.
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