Updated: Fri, 19 Apr 2013 13:30:00 GMT | By Lorna Cooper
Iron Man 3 London premiere

Iron Man 3 UK premiere: Robert Downey Jr and Susan Downey

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The cast of Iron Man 3 (minus Gwyneth Paltrow, who couldn't attend the re-scheduled date) hit London's Leicester Square for the swanky launch of what's bound to be one of the biggest films of the year.

Robert Downey Jr, oblivious to onlookers, hugged and kissed his producer wife Susan while the crowd cheered him on; premieres rarely get this obvious a public display of affection. Next time Robert, maybe get a room?

Marvel's Iron Man 3 pits brash-but-brilliant industrialist Tony Stark/Iron Man (played by ever charismatic Downey Jr) against a formidable enemy.

When Stark finds his personal world destroyed at his enemy's hands, he embarks on a harrowing quest to find those responsible. Check out the photos of the cast having fun at the premiere...