Jennifer Lawrence
Actress Jennifer Lawrence attends the "X-Men: Days of Future Past" world movie premiere in New York.Reuters

In what could shock the celebrity world, alleged nude photos of big celebrities like Oscar-winning actress Jennifer Lawrence, Ariana Grande, Victoria Justice and Kate Upton were leaked online on Sunday, and pictures of several other big celebrities could also be leaked.

The controversial photos were allegedly taken from the celebrities' mobile phones vulnerable to hacking, according to BuzzFeed reports. A slew of alleged nude photos of Jennifer Lawrence have been posted on the 4chan thread.

The first victims of the massive hack are Jennifer Lawrence, Ariana Grande, Victoria Justice and Kate Upton. But the hacker has claimed to have a long list that includes celebrities like Kim Kardashian, Rihanna, Cara Delevingne, Candice Swanepoel and Mary Kate Olsen.

The hacker also posted two screenshots of his desktop, hinting that he has many more photos and videos yet to be released online.

Jennifer Lawrence's spokesperson has confirmed the pictures in a statement to BuzzFeed.

"This is a flagrant violation of privacy. The authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence," Lawrence's spokesperson told BuzzFeed in a statement. Kate Upton's publicist also told the site that they were looking into it.

However, Victoria Justice wrote on her twitter page that the alleged nude photo of her is fake.

Actress Mary Winstead, who is one of the people listed in the hacker's list, reacted on her twitter page.

It may be recalled that pop star Ariana Grande was in news a few months ago over nude photo scandal but it turned out to be photoshopped pictures. Celebrities, who became victims of photo scandal recently, includes Demi Lovato and Selena Gomez.

However, it looks like it's going to be different this time around, as several celebrities could become victims if the threat of the hacker is anything to go by.