Demi Moore and Ashton Kutcher are reportedly "embarrassed and angry" after learning that candid camera phone snapshots are circulating in cyberspace.
The photos - taken on a phone Ashton lost during a trip to Spain in April - include nude shots of Demi posing on a bed, according to U.S. tabloid the National Enquirer.
Reports suggest the man who found the phone in the back of a taxi is now offering the snapshots to sleazy websites - for $1 million (£500,000).
A source tells the Enquirer: "In some of the 35 pictures, Demi lies sprawled naked on a bed with a light and dark red-patterned pillow propping her lower back.
"Another shows a bare-chested Ashton taking a photo of himself in the mirror."
The lost phone also featured telephone numbers of the couple's celebrity pals.
The source adds: "People started calling the phone, asking for Ashton. Finally Ashton decided to ring it and spoke to the guy. He demanded that the guy give it back but the man switched the phone off.
"When Demi and Ashton got word that someone had their racy pictures, they freaked out."