Scarlett Johansson has admitted that she took naked photographs of herself which were leaked online.
The 26-year-old Lost In Translation star, who has never appeared fully nude in her movies, has been left humiliated after the explicit pictures were published on a website yesterday.
The FBI has, meanwhile, been called in to investigate how the private photographs were hacked from her mobile phone - and it emerged today that it is closing in on the suspected hacker.
Law enforcement sources told TMZ authorities are 'honing in' on the criminal gang, with the identity of one of the ringleaders known to the FBI.
Johansson is the latest victim of the phone-hacking ring thought to be responsible for stealing naked photos and videos from at least 50 female Hollywood celebrities.
Johansson's lawyer today issued a statement making it clear that his client took the explicit pictures.
One of the photographs shows her posing seductively with her top off, while in another her bare behind is visible in a mirror.
The photographs show wallpaper in the background which matches the design in previously seen pictures from inside her bedroom in Los Angeles.
While parts of her body have been exposed for her movie roles, she has never before been seen completely naked.
'The highly personal and private photographs at issue capture our client self-posing in her own home in a state of undress and/or topless,' the statement, from lawyer Marty Singer, read.
He also threatened to sue any media outlet which publishes the pictures under copyright laws - the fact that Johansson holds the rights confirms that she took the pictures and that they are authentic.
Authorities also today confirmed it is looking into the case.
'The FBI is investigating a person or group responsible for a series of cyber intrusions of high-profile figures,' FBI spokeswoman Laura Eimiller said.
'This would include many devices - could mean a computer, desktop, laptop, iPad, cell phone... intrusions into personal online accounts too.'
Other stars reportedly targeted include actresses Jessica Alba, Vanessa Hudgens, Selena Gomez and Miley Cyrus, as well as singer Christina Aguilera.