Invasion of the body snatchers

Isla Fisher arrives for the premiere of her new film, Burke and Hare, at the Curzon Chelsea cinema in London last night.

The 34-year-old actress revealed she only pretended to squeeze into a corset for the period comedy because she was three months pregnant during filming.

Fisher – who gave birth to her second child with husband Sacha Baron Cohen this summer – plays actress Ginny in the black comedy directed by John Landis.

Her character is the love interest to Simon Pegg, who stars opposite Andy Serkis in the film as infamous grave robbers Burke and Hare.

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