Lawrence's spokesperson had made a similar comment, adding that authorities have been notified, while Winstead responded to the leak of her photos on Twitter.
Upton has posed topless before at professional photo shoots and in social media posts and was also photographed naked, with body paint, for Sports Illustrated. She said in July that she does not plan to pose for nude magazine Playboy any time soon.
Online users have speculated that all the racy photos, which were first spotted on an 4Chan thread, were possibly collected by more than one hacker and stolen from victims' online file storage accounts. Authorities have not commented about the leak and no hacking suspects have been identified.
Stealing and distributing photos without permission could carry a jail sentence. In 2012, a man was sentenced to 10 years in prison for releasing private photos of Scarlett Johansson and Mila Kunis.
Actress and writer Lena Dunham, who was not targeted in the nude photo leak and has appeared naked onscreen several times on her HBO show Girls, took to Twitter to have her say about the ongoing scandal.
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