Published Sunday, 22 December 2013
X Factor winner Sam Bailey with a copy of her Christmas number one single (© PA)
The 36-year-old former prison officer sold twice as many copies of her single, Skyscraper, than US star Pharrell Williams who came in second with Happy.
Sam was crowned the winner of this year's X Factor at the end of the big finale last week.
All proceeds from her winning single are being split between Great Ormond Street Hospital Children's Charity and Together For Short Lives, a charity which helps children with life-threatening conditions.
At least £1 for each CD sold and at least 20p for each download sold in the UK are being donated, while Chancellor George Osborne has agreed to waive VAT on the release.
Simon Cowell said: "I am thrilled that we can do something to help by donating the sales of The X Factor winner's single to them both."
On Sunday Sam told OfficialCharts.com: "Being Number 1 is absolutely amazing.
"It really is the icing on the cake and it means Great Ormond Street Children's Charity and Together For Short Lives will benefit from the single, which makes it extra special."
She sold 149,000 copies of Skyscraper in the past week, becoming one of the fastest selling singles of the year.
One More Sleep by the former X Factor winner Leona Lewis came in third spot.
Meanwhile, Robbie Williams beat One Direction and Gary Barlow to the Official 2013 Christmas Number 1 Album with Swings Both Ways.
© UTV News