Fox has recruited quite a diverse mix of has-beens for Celebrity Boot Camp. Among the B- and C-listers signed up: rapper Coolio, '80s pop tart Tiffany, Kato Kaelin, former Married... With Children weasel David Faustino, ex-Milli Vanilli "singer" Fabrice Morvan, Renegade star Lorenzo Lamas and Brady Bunch son Barry Williams. The two-hour special will air Sept. 30 at 8 pm/ET.