Ozzy and Sharon Osbourne's son Jack has had a "high-value amount" of jewellery stolen at Los Angeles Airport.
The family found fame on TV show The Osbournes
Jack Osbourne, 19, who found fame on the family's TV show The Osbournes, was travelling from LA to London on 11 February when the theft took place.
A spokesperson for the airport, said: "The airport police received a crime report on 16 February regarding a high value amount of jewellery."
Los Angeles police, airport police and federal authorities are investigating.
The Sun newspaper reported that watches were among the items in a jewellery box that was taken from a suitcase.
Osbourne, who has had treatment for drug problems, is also reportedly preparing to present Celebrity Wrestling on ITV from April.
The theft comes three months after his parents were the victims of a burglary in which jewellery including rings, necklaces and a sapphire were stolen from their Buckinghamshire home.
A £100,000 reward has been offered for information leading to a conviction in that case.