Courtesy of TNTTNT's annual holiday special Christmas in Washington airs tonight at 8 p.m. ET/PT.  Diana Ross performs for a packed house, including President Barack Obama and his family, on the show, which was taped on December 9 at the National Building Museum in Washington, D.C.

Joining the legendary Motown diva on the program are pop star and X Factor judge Demi Lovato, American Idol season 10 champ Scotty McCreery, Smash star Megan Hilty and The Voice season two finalist Chris Mann.  Closing out the special is PSY, the South Korean rapper whose hugely popular hit "Gangnam Style" has started a new dance craze.

Hosting TNT's Christmas in Washington is Conan O'Brien.  Proceeds from the annual event are donated to a leading children's hospital.

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