Demi Lovato will be spending Christmas in our nation’s capital…

The 20-year-old half-Mexican singer and The X Factor judge, who will be performing in VH1’s annual Divas concert, will headline the annual Christmas in Washington special airing December 21 on TNT, along with “Gangnam Style” sensation PSY and the Supreme Diana Ross.

Late-night talk show host Conan O’Brien will host the telecast, which will be taped in Washington D.C.’s National Building Museum, for the second consecutive year.

Additional performers include former American Idol winner Scotty McCreery, who recently released an album of holiday music, as well as Smash star Megan Hilty and former The Voice finalist Chris Mann.

President Barack Obama and First Lady Michelle Obama will attend.

This is the 14th year TNT will be broadcasting Christmas in Washington to benefit the Children’s National Medical Center.