The two-hour, live-performance show, to be hosted by Cat Deely, will feature the 16 finalists in the dance competition. Nigel Lythgoe and Mary Murphy will also be judges.
Chenoweth received a Tony Award for her performance in You're a Good Man Charlie Brown and a Tony nomination for Wicked. She was most recently seen on Broadway in Promises, Promises.
In addition, she received the Emmy for her work on Pushing Daisies and an Emmy nomination for her portrayal of April Rhodes on the FOX series Glee. She will star next season on ABC's Good Christian Belles.