>> RELATED: Emma Watson 'nude photo' threat was a viral stunt to shut down 4chan, report says

The images reportedly were posted to Reddit and 4chan late Friday, and their authenticity has not been verified.

Lawrence, Rihanna, Kim Kardashian, Kate Upton, Vanessa Hudgens and Gabrielle Union were among the victims of two previous celebrity nude photo hacks, entertainment news site TMZ reported. The stars' iCloud accounts were compromised in the first hack in August, according to the Huffington Post.

>> RELATED: Celebrity nude photo hack: Rihanna, Kim Kardashian among victims

Union and her husband, Dwayne Wade, released a statement to TMZ last Saturday.

"It has come to our attention that our private moments, that were shared and deleted solely between my husband and myself, have been leaked by some vultures," Union said. "I can’t help but to be reminded that since the dawn of time women and children, specifically women of color, have been victimized, and the power over their own bodies taken from them. These atrocities against women and children continue worldwide."

>> Read more trending stories

Union said she has contacted the FBI.