Each of three celebrity judges and the viewing audience chose their favorite music star wannabe on Wednesday's show from the cast who had failed earlier cuts.
Viewers returned John Peter Lewis, 24, of Idaho, to the running with their votes.
The four wild card selections join Fantasia Barrino, Diana Degarmo, Camile Velasco, Matthew Rogers, La Toya London, Amy Adams, Jasmine Trias and John Stevens, who had previously been tapped as finalists.
The 12 finalists will perform Tuesday in a two-hour live show on Fox. The group will be whittled to four on May 5, with the winner selected in the series finale May 25-26, E! Online reported.