Yeas & Nays reports that the following celebrities will be in attendance: Italian opera singer Andrea Bocelli, Mariah Carey, Miranda Cosgrove, Annie Lennox, Maxwell and "Glee" star Matthew Morrison--all of whom will be singing.
Ellen DeGeneres will host the celebration, which benefits Children's National Medical Center.
It will air on December 17th.
The real question is where will all these celebrities stay and eat? Email us if you see them in Penn Quarter!