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.
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