Actress Scarlett Johansson has become the latest celebrity to fall victim to apparent leaked nude photos from her mobile phone.
The FBI has been drafted by 'The Avengers' actress to investigate, according to celebrity news website TMZ.
An FBI spokesman declined to confirm or deny the investigation, and a representative for Johansson was not immediately available for comment.
The photos show the 26-year-old actress in a towel with an exposed backside, while another shows her topless.
They were posted on several celebrity gossip websites yesterday.
Johansson's nude pictures are the latest to hit the internet after other Hollywood actresses, including Jessica Alba and Vanessa Hudgens, also suffered the embarrassment of having explicit photos appear on the web.