Ben Stiller has introduced the world to Derek Zoolander's son.

The 49-year-old star - who starred as the male model in the 2001 hit comedy film 'Zoolander' - is set to reprise the role in the eagerly-awaited sequel and has revealed the identity of his character's on-screen son, played by Cyrus Arnold.

The comedian posted an image of himself alongside Cyrus on Instagram, and captioned it: ''Meet @cyrusarnold. Son of Derek. #Zoolander2''

The image comes shortly after Karl Lagerfeld revealed he's turned down a cameo role in 'Zoolander 2'.

The Chanel creative director was approached to make an appearance in the long-awaited movie but said he has no desire to turn his hand to acting.

He revealed: ''I don't want to be in the movie. They wanted me to be in the movie! I'm not an actor.''

The film was officially announced when Ben Stiller and Owen Wilson made a surprise appearance in character as Derek Zoolander and Hansel McDonald during Valentino's recent Paris Fashion Week show.

However, the outspoken designer didn't welcome the interruption, saying: ''I didn't like it.''

'Zoolander 2' - which is also rumoured to star hip-hop icon Kanye West - is set for release in February 2016.