Entertainment Justin Bieber joins cast of 'Zoolander 2' Justin Bieber's blue steel better be strong enough to model with Derek Zoolander. Photo Credit: INSTAGRAM/justinbieber By FRANK LOVECE. Special to Newsday Updated April 30, 2015 8:04 AM Print Share Share Tweet Share Email Pop star Justin Bieber is joining the cast of "Zoolander 2," the sequel to the 2001 comedy hit. 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. By FRANK LOVECE. Special to Newsday Share on Facebook Share on Twitter Comments Comments section is temporarily on hold. Here’s why.