Former American Idol finalist Hudson and country music duo Sugarland will take to the stage for performances during Thursday's results show.
It has also been confirmed that next week's performance show will see the Top 11 attempting classic Motown tracks.
Hudson appeared on the third season of the Fox competition, and went on to win an Academy Award for her role in Dreamgirls. She is currently preparing to release her new album I Remember Me later this month.
This week's American Idol saw the Top 12 performing tracks released in the year they were born, before one finalist was sent home during a results show that featured appearances by season nine winner Lee DeWyze and the Black Eyed Peas.
A compilation of the contestants' studio performances and single tracks is available on iTunes now, with profits from downloads being donated to the American Red Cross to aid its work in Japan following the earthquake and tsunami.
American Idol airs Wednesdays and Thursdays on Fox.
> Click here to find out which finalist was sent home this week