Ozzy Osbourne and his daughter Kelly are the latest artists to announce their bid for the Christmas number one.
Kelly Osbourne will team up with her father for the Christmas single
The pair will sing together for the first time on the duet, Changes, released on 8 December
The song is a new version of a track originally recorded by Ozzy's old band Black Sabbath. It appeared on the 1972 album Black Sabbath Volume 4.
The Osbournes are the latest in a string of high-profile acts bidding for this year's Christmas chart-topper.
The 12 Pop Idol finalists are currently 3/1 favourites to top the charts over the festive season with a cover version of the John Lennon classic Happy Xmas (War Is Over), released on 15 December.
The Darkness are second favourites for the Christmas number one with their seasonal track (Christmas Time) Don't Let The Bells End.
Sir Cliff Richard, comedian Avid Merrion and Blue are also expected to release festive songs.
Gennaro Castaldo of music retailer HMV said: "This could be one of the tightest races for the Christmas number one in recent years."