Mila Kunis, Laura Prepon and Wilmer Valderrama are also set to appear on the two-hour program airing Sunday, April 22.
Ashton Kutcher Signs on for 'That '70s Show' Reunion on 'Fox's 25th Anniversary Special' - Hollywood Reporter
Ashton Kutcher Signs on for 'That '70s Show' Reunion on 'Fox's 25th Anniversary Special' - Hollywood Reporter