Amanda Seyfried threatens legal action over leaked nude photos of her with her ex just a day after Emma Watson revealed her personal pictures had been stolen

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Amanda Seyfried has demanded that nude pictures of her are removed from the internet amid fears celebrities' computers are being hacked for personal photos.

Pictures of the actress appeared online yesterday alongside photos stolen from Harry Potter star Emma Watson.

Seyfried's lawyers are now threatening a website with legal action if they don't take the images down, it was reported today.

Personal pictures of Amanda Seyfried and Emma Watson have been stolen and posted online

A letter from her legal team, seen by website TMZ, states: 'Several very private photographs of Ms. Seyfried either in various states of nudity or in intimate moments with her former boyfriend (the 'Seyfried Photographs') have been reproduced and posted.'

The batch of images of Seyfried are also believed to have been posted on 'the dark web', a matrix of encrypted websites that allow users to surf with anonymity.

Seyfried is currently engaged and expecting her first child with Thomas Sadoski.

The intimate photos that were stolen are from her time with actor Justin Long, whom she dated from 2013 to 2015.

It is unclear if the photos were stolen from Long or Seyfried's device. 

Seyfried has starred in a string of hit films, including Mamma Mia!, Jennifer's Body and Les Misérables, since she first appeared in teen comedy Mean Girls in 2004.

Seyfried's lawyers sent out a warning that intimate photos had been stolen. She and Justin Long, pictured, dated from 2013 to 2015

Seyfried is now engaged to actor Thomas Sadoski, with whom she is expected a baby

The stolen photos of Emma Watson showed her posing in a range of swimsuits during a fitting she attended.

They were posted online alongside photos of a woman in the bath, whose face is not visible.

A spokesman for Watson confirmed the pictures of her in the swimsuit had been stolen, but denied nude photos were hers.

The spokesman said: 'Photos from a clothes fitting Emma had with a stylist a couple of years ago have been stolen.

'They are not nude photographs. Lawyers have been instructed and we are not commenting further.'

The pregnant star has not spoken personally about the photos or the legal action she is taking

Another US actress, Mischa Barton, yesterday spoke of her anguish over a leaked sex tape. 

She told a news conference in Los Angeles she was taking action to stop the potential sale of a sex tape made against her will in a so-called 'revenge porn' case.

Barton told reporters she had obtained a restraining order, and that cease-and-desist letters had been sent to those believed to be trying to buy or sell the images. 

'I just want to say that I have been put through an incredibly hard and trying time,' said the 31-year-old actress, best known for her starring role in The OC. 

'I came forward to fight this, not only for myself but for all the women out there,' she said. 'I want to protect them from the pain and humiliation that I have had to go through.'

Barton's lawyer, Lisa Bloom, said someone the actress had once dated was offering the tape for $500,000 (£400,000), adding that buyers could be prosecuted.

US actress Mischa Barton yesterday spoke of her pain over a sex tape said to be for sale

The images were recorded during the last year, she said, refusing to identify the culprit, citing an ongoing police investigation.

The latest series of leaks have led to fears that stars' computers are again being targeted by hackers who want to profit from posting pictures online. 

Dozens of celebrities' photos were posted online as part of a 2014 'phishing' exercise, including shots of Jennifer Lawrence, Rihanna, Kate Upton and Kirsten Dunst.

Last month, a 29-year-old Chicago man was jailed for nine months for hacking into the electronic accounts of celebrities on Apple's iCloud service, and stealing private information including nude videos and photos.

Apple admitted a 'targeted attack,' but denied its cloud storage system had been breached.