Two nude photos of Scarlett Johansson that appeared online Wednesday after her phone was hacked have been removed from PerezHilton.com, The Dirty.com and other websites that posted the 'Not Safe for Work' (NSFW) images.

Marty Singer, the actress's lawyer, has sent a legal notice to the sites asking them to remove the stolen copyright protected private photographs or face legal action.               

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, TMZ reported quoting Singer. If you fail to comply, you will be acting at your own peril. Please govern yourselves accordingly.

The photos made the rounds online, spreading like wildfire on blogs, news sites, and social networking sites like Facebook and Twitter.

The photos were taken by Johansson herself and were saved in her cell phone. The 26 year old actress, is seen topless on what appears to be an animal skin rug, and also nude in the reflection of a bathroom mirror.

However, the cell phone was hacked and hackers leaked the photos, according to the actress.

The man behind one of those sites, Nik Richie of TheDirty.com, told E! News that, he felt bad for the actress when the photos hit the net. I usually never remove images I get from hackers or third parties, he explained. When you're a public figure, you're looking for attention as far as press and media. But in Scarlett's case, I felt for her.

Johansson is one of 50 A-list celebrities who have fallen victims to hacking of cell phones and Internet addresses in the recent past.

The FBI has reportedly been investigating hacks into as many as 50 celerity email accounts, including Vanessa Hudgens, Jessica Alba and Mila Kunis.

The FBI has identified the brain behind the hacking and they are in the process of identifying the hackers, TMZ reported.

According to TMZ, sources said that the gang earlier gained access to cell phones of other celebrities, including Vanessa Hudgens, Jessica Alba, Lindsey Vonn, Ali Larter and Emma Caulfield.