Sharon Osbourne said she hoped a £100,000 reward for information about a jewel raid at her home would lead to the culprit being found.
Ozzy Osbourne tackled a burglar in his home on 22 November
She issued the plea on the BBC's Crimewatch programme on Tuesday night.
A burglar stole gems worth £2m despite being put in a headlock by Sharon's rock star husband Ozzy at their home in Chalfont St Peter, Bucks, last month.
In a pre-recorded message, Sharon pleaded with viewers who knew the raider to "turn him in".
She also revealed that she feels anxious being in the house following the incident.
Items taken during the burglary included wedding rings, an engagement ring, pearl and diamond necklaces, a large 52-carat sapphire ring and two pairs of diamond earrings, which Mrs Osbourne says are "totally irreplaceable".
"I hope that somebody out there realises that there's a £100,000 reward for this jewellery", she said.
"I hope that, because it's near Christmas and everybody needs cash for Christmas... this will spur somebody on to say: 'You know what? I know who did it and why not get the money?"'
The reward is believed to be one of the biggest offered in criminal history.
Calls to hotline
The offender is described as 5ft 10in tall, light skinned, very slim and wearing a light jacket, dark trousers, trainers and a ski mask.
The show's presenter, Nick Ross, later revealed that they had received 31 calls about the Osbourne burglary, including one complaining that the show was only covering the case because of the family's fame.
The message was pre-recorded as Sharon Osbourne, an X Factor judge, was appearing at the Royal Variety Performance on Tuesday night with daughter Kelly.
Ozzy had to pull out of a planned performance at the last minute because he needs an operation to adjust a metal plate inserted in his shoulder after a quad bike crash last year.