The behind-the-scenes action on Iron Man 2 is almost as exciting as the movie itself.

Gwyneth Paltrow, who returns as Iron Man’s PA Pepper Potts, is furious that new co-star Scarlett Johansson is stealing her limelight.

Scarlett, who plays a Russian spy, appears in a promotional campaign alongside the film’s other stars, Robert Downey Jr and Mickey Rourke.

A source said: ‘Gwyneth was afraid she’d be upstaged by Scarlett and not being in the campaign was the final straw.

‘She is furious she’s been left out.’

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