Olivia Munn claims leaked photos allegedly of her are in fact fakes.

Sources close to the 31-year-old actress have told TMZ.com the provocative pictures - which have emerged on websites showing a woman said to be Olivia in lingerie, a bikini and a low-cut V-neck T-shirt as well as completely naked - are not images of her.

The 'Iron Man 2' beauty has since taken to her twitter account to deny the photos - which are said to be of an unknown woman claiming to be the actress - are of her.

In a message accompanied by a picture of a baby and a cat, she tweeted: ''If you ever hacked my phone, these are the pictures you'd find.''

Earlier this year, Olivia was photographed naked alongside a rabbit for PETA's 'I'd Rather Go Naked Than Wear Fur' campaign, and in 2010 she was picture nude in another campaign for the organisation which featured the tag line: ''As nature intended, let elephants be free. Boycott the circus''.