Christmas number one 2013: X Factor winner Sam Bailey beats Pharrell Williams with 'Skyscraper'
Robbie Williams keeps One Direction off the top spot in the albums chart
The 36-year-old former prison officer sold 149,000 copies of the Demi Lovato cover, more than double that of US rapper Pharrell Williams, who secured the second spot with his track "Happy".
Bailey, who was crowned X Factor winner last week, is splitting all proceeds between Great Ormond Street Hospital Children's Charity and Together For Short Lives, a charity which helps children with life-threatening conditions.
Chancellor George Osborne has agreed to waive VAT on the release.
Bailey 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."
Despite the annual anti-X Factor campaign, this year led by AC/DC’s 1979 single, "Highway to Hell", Bailey’s track has become one of the fastest-selling singles of the year.
"One More Sleep" by the 2006 X Factor winner Leona Lewis came in third spot and "Highway to Hell" took fourth place, giving AC/DC their first ever top ten hit.
Robbie Williams held on to top spot in the album chart with Swings Both Ways.
The Take That star's record was neck-and-neck midweek with One Direction's Midnight Memories and Gary Barlow's Since I Saw You Last in a tight race.
But Williams beat off One Direction by less than 200 copies after both acts sold more than 126,000.
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A statement was published on his fansite, True To You, following release of new album
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