Images showing a nude Jlaw have been uploaded to the internet as part of a package of hacked images in the second such leak of hacked personal pictures of stars by 4Chan and other online sites such as Gizmodo.
The list of celebs involved in the leak also includes actress Vanessa Hudgens and child star and actress Mary-Kate Olsen. New pictures of Lee Sobieski have also been leaked in this latest cache.
It is not obvious when the pics were taken but research into the leak are currently in progress by the authorities.
Earlier this month over 100 celebrities were targetted by a group of hackers who stole hundreds of naked pics and sex tapes from their personal phones and leaked on the web.
The original collection of images also included stars Mary E Winstead, Kirsten Dunst and Victoria Justice.
Reps for Jennifer Lawrence released a statement on their twitter accounts saying they were verifying the authenticity of the photos.