Hudson, who was a third-season "Idol" finalist, will tape a song in front of the "Idol" studio audience following the March 25 broadcast, according to Variety. Hudson's performance will be broadcast on a future "American Idol" episode. She is expected to perform a song from her self-titled Grammy-winning CD.

Jennifer Hudson earned several trophies — including the Oscar for Best Supporting Actress, the Golden Globe Award and the Screen Actors Guild Award — for playing the role of Effie in the Bill Condon-directed "Dreamgirls," her film debut. Hudson, who was seen in the Actors Fund benefit concert of The Best Little Whorehouse in Texas, had a featured role in last summer's "Sex and the City" feature film.

This season's "American Idol" features Adam Lambert as a finalist. Lambert was seen in the Los Angeles production of Wicked.