SCARLETT Johansson has called in the FBI after alleged nude photos of her stolen by hackers were leaked to celebrity websites.

The actress is feared to have become the latest Hollywood star to fall victim to a mobile phone hacker ring responsible for stealing photos and videos from up to 50 A-list stars.

One of the photos of Johansson, which appears to be a self-portrait, show her topless.

Another shows her naked from head-to-toe from behind while taking a photo in a mirror.

Black Swan star Mila Kunis was also named as a target, with hackers allegedly uncovering pictures of a shirtless and "seductive" Justin Timberlake on her phone.

Another image is said to show Timberlake with pink underwear on his head while there reported to be a separate explicit shot of an unidentified male.

A fourth image is said to show Kunis in a bath, covered by the tub from the neck down.

Kunis and Timberlake, co-stars in the film Friends With Benefits, have long denied rumours of an off-screen romance.

His bodyguard was even arrested trying to prevent photographers from snapping them together.

It is not clear if the Johansson and Kunis incidents are related and the authenticity of the photos could not be verified.

Celebrity website TMZ.com reported that Johansson, 26, had called in the FBI as a "criminal act" had been committed.

"The FBI is aware of the alleged hacking incident and is looking into it," an FBI official told FoxNews.com.

Johansson was named earlier this year as one of the 50 victims who had their mobile phones or emails compromised by a hacking gang.

High School Musical star Vanessa Hudgens met with the FBI to discuss the hacking of her Gmail account after photos of her kissing another woman were leaked online.

Other stars said to have been targeted by the gang included Jessica Alba, Selena Gomez, Demi Lovato, Christina Aguilera, Ali Larter, and Miley Cyrus.

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Originally published as Star calls in FBI over nude iPhone photos