Roberts made the announcement Tuesday on the morning talk show.
"I am nervous ... but you got to step outside of your comfort zone," said said. "I think I am going to take the perspective of those who normally watch at home."
And on Twitter...
Roberts' appearance on Dancing With the Stars will kick off a series of guest judges on upcoming episodes, including Julianne Hough, Ricky Martin and LMFAO's Redfoo.
[New York Daily News]
2014: The Year in Music [PHOTOS]