Pop star Justin Bieber is joining the cast of "Zoolander 2," the sequel to the 2001 comedy hit.

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Star and director Ben Stiller, 49, who has been posting casting notices on his Instagram page, on Wednesday added a black-and-white photo of himself, seemingly in character as male model Derek Zoolander, staring in profile at Bieber, 21.

The caption read, " 'Zoolander 2.' Justin Bieber." Stiller had recently announced via Instagram that Fred Armisen and Kyle Mooney were joining a cast that includes returning stars Owen Wilson, Christine Taylor and Will Ferrell and newcomers Kristen Wiig and Cyrus Arnold.