She will be joining regular panelists Len Goodman, Bruno Tonioli and Carrie Ann Inaba at the table next Monday, March 31.
The news was announced Tuesday on the morning show. Roberts will be the first of several guest judges scheduled this season, including Julianne Hough, Ricky Martin and Redfoo from LMFAO.
Roberts' appearance advances an already tight relationship between the two shows. "Good Morning America" usually gets a ratings boost when contenders from "Dancing With the Stars" appear for interviews, a big help in its own competition with the "Today" show.
The Associated Press contributed to this report.