Shah Rukh Khan celebrated his birthday with Katrina Kaif, Anushka Sharma and Anand L Rai at the trailer launch of his upcoming film 'Zero'.

Directed by Aanand L Rai, the film sees SRK playing a vertically challenged man, Bauua Singh, whilst Katrina takes on the role of a superstar. Anushka plays a wheechair bound scientist.

Produced on an estimated budget of $28 million, Zero is Khan's most expensive film to date. It also marks the last film appearance of Sridevi, who died shortly after completing the film.

At the launch of the trailer at IMAX Wadala, in Mumbai, team Zero also celebrated Shah Rukh Khan's 53rd birthday, making it even more special for his fans across the world.

A celebration of life - Zero is in cinemas on 21 December.