Demi Lovato covers Mariah Carey's 'All I Want For Christmas Is You'

'X Factor USA' judge Demi Lovato has recorded a cover of Mariah Carey's holiday classic 'All I Want for Christmas is You'.

Demi performed her version of the festive favourite for the TNT television special 'Christmas in Washington' on Saturday.

Singing for the President and his family, Lovato could hardly contain her enthusiasm and later tweeted, "OH MY GOD.. I just met the PRESIDENT OF THE UNITED STATES!!!!! Our First Lady is GORGE. So excited right now!!!"

Demi's latest single 'Give Your Heart a Break' from her third studio album 'Unbroken' is also out now.

What do you think of Demi's version? Leave a comment and let us know.