Performers for the holiday celebration include Diana Ross, "Smash" star Megan Hilty, chart-topping recording star Demi Lovato, "The Voice" favorite Chris Mann and "American Idol" winner Scotty McCreery.
The evening concludes with a special performance by "Gangnam Style" sensation PSY.
Celebrating its 31st anniversary this year, "Christmas in Washington" is a holiday tradition benefiting the Children’s National Medical Center. The concert is attended each year by the President and First Lady, as well as many other Washington VIPs.
This marks TNT's 14th year presenting "Christmas in Washington."