The pictures, which first appeared on image-sharing site 4chan, show most of the celebrities nude or in provocative poses.
A spokesperson for Jennifer Lawrence confirmed the photos were real and blasted the hackers.
"This is a flagrant violation of privacy. The authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence," Jennifer Lawrence's representative said.
Another photo showing 'Final Destination 3' star Mary Elizabeth Winstead naked was also posted. The actress responded to the leak on Twitter.
"Knowing those photos were deleted long ago, I can only imagine the creepy effort that went into this. Feeling for everyone who got hacked," she said.
A picture showing model Kate Upton covering her modesty also circulated online.
A total of 101 celebrities were hacked, although it is unclear how many of those photos are authentic.
Other stars on the list include Aubrey Plaza, Kim Kardashian, Vanessa Hudgens, Rihanna, Lea Michele, Hillary Duff, Cat Deeley and US soccer star Hope Solo.
Actress Victoria Justice, however, insisted that the photos of her were fake.
"These so called nudes of me are fake people. Let me nip this in the bud right now (pun intended)," she said.
Many celebrities have been victims of nude photo leaks. In late 2012, a man was sentenced to 10 years in prison for hacking into the online accounts of Scarlett Johansson and Mila Kunis and posting their private pictures online.