X Factor winners Little Mix are currently not favourite to claim this year's Christmas number one.
The band, who became the first girl group to win the show on Sunday night (December 11), have tough competition from Nirvana's re-release and
Little Mix are the 13/8 second favourites to take the prestigious Christmas Number One.
Jessica Bridge of Ladbrokes said: 'We underestimated Little Mix. Gareth and the Military Wives look to have a real fight on their hands.'
'The X Factor final was one of the closest we've ever seen and it looks like Little Mix are set for another closely fought showdown,' she added.
Nirvana will re-release 'Smells Like Teen Spirit' to boost their chances of scoring this year's Christmas number one.
The band's decision comes after their fans have set up the group 'Nirvana for Christmas No1' on Facebook which has gained more that 107,000 likes so far.
The 'Nirvana for Christmas No1' will be hoping to repeat the success of 2009's Facebook campaign which successfully helped Rage Against The Machine's track 'Killing In The Name' claim the Christmas Number One spot ahead of X Factor winner Joe McElderry.
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