Story : The Osbournes prepare for Christmas in a series of skits. The dogs are dressed in festive attire; Sharon horrifies Kelly by trying to make her dress ""Christmasy"" for the family's upcoming party; Mandy Moore tries in vain to get Jack and Kelly into the holiday spirit; and Ozzy very reluctantly performs a holiday duet with fellow MTV reality star Jessica Simpson. The family hosts a blow-out celebrity bash for the holidays, complete with cooking segments, a visit from Santa, Christmas carols, and a unique version of ""'Twas the Night Before Christmas.""