As previously announced, Tony Award nominee Helen Mirren and "Real Housewives" star NeNe Leakes will guest star on the Jan. 17, 2012, episode. Mirren will play the "inner voice" of a character on the series, and Leakes will be swim coach Roz Washington.
Also making an appearance on "Glee" will be Evita's Ricky Martin, who will play a Spanish teacher, and Gloria Estefan, who will play Santana's mother.
"Glee" airs Tuesday nights on Fox at 8 PM ET.
To watch the interview with Rivera, look below: