Vanessa Hudgens belts out a song alongside American Idol alum Katharine McPhee and R&B singer Ne-Yo during the filming of TNT’s Christmas in Washington 2007 at The National Building Museum in Washington, D.C. on Sunday.

Other artists slated to perform: Alan Jackson, Andrea Bocelli, Colbie Caillat and Heather Headley.

The special will be hosted by Dr. Phil and his wife Robin McGraw and will benefit the Children’s National Medical Center.

Watch Vanessa and the gang perform Wednesday, Dec. 12 @ 10PM ET/PT on TNT.