Ben  Stiller and Justin Bieber face off in an image from Stiller's Instagram account, suggesting the singer has joined the cast of <i>Zoolander 2</i>.

Ben Stiller and Justin Bieber face off in an image from Stiller's Instagram account, suggesting the singer has joined the cast of Zoolander 2. Photo: Ben Stiller/Instagram

Justin Bieber has nailed his Blue Steel in what appears to be a sure sign he is joining the cast of Zoolander 2.

Ben Stiller, who is directing and starring in the belated sequel to the 2001 comedy, has posted a picture of himself and the Canadian pop star in full stare-off mode on Instagram and Twitter.

Though uncaptioned, apart from the tag #Zoolander2, it most likely indicates the 21-year-old has a role of some sort in the film.

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In fact, Bieber has all but confirmed it. On April 28, he posted on his facebook page that he was "working on something big right now in Europe."

He concluded the post with the words "he is so hot right now", a line from the 2001 film.

Stiller – whose most recent movie is the comedy While We're Young, in which he plays a documentary filmmaker suffering a mid-life crisis, is showing he is far from out of touch when it comes to drumming up interest in his forthcoming film by announcing much of the casting news via social media.

The casting of Penelope Cruz, Fred Armisen and Billy Zane all cropped up first on Instagram, though none can compete with the exposure granted by the 63.1 million followers to whom the really-really-good-looking Bieber retweeted the photo from his own Twitter account.

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