Pictures of Britney Spears' month-old baby, taken during a shoot, have been stolen, her spokespeople have said.
Britney Spears and Kevin Federline married in 2004
Photos of the singer and her son were posted on the internet but removed after she threatened legal action.
A statement said use of the photos would be an "invasion of privacy".
"Anyone who publishes, sells or otherwise exploits any of these images in any way will be subject to liability and damages for wilful infringement of copyright."
It is not known whether the singer has approached the police to investigate the alleged theft.
Spears has kept her son Preston - her first child - away from the glare of the world's media.
The only images of the baby have been unauthorised grainy, long-distance shots published in celebrity magazines.
The baby's father is dancer Kevin Federline, Spears' husband since September 2004.
She confirmed her pregnancy in April following months of tabloid speculation.
Federline has two children by his ex-girlfriend, actress Shar Jackson, one of which was born after he and Spears started dating.