While Jones, McGrath and Warwick have all made prior guest appearances on reality shows, Jackson and Rinna have more extensive reality ties.
In 2007, Jackson participated in Armed & Famous, a CBS reality series which followed a group of celebrities as they became reserve police officers and spent several weeks on patrol in Muncie, IN. Last year, she also competed on Celebrity Big Brother in the U.K.
Rinna competed on Dancing with the Stars' second season in 2006 and finished fourth with professional partner Louis van Amstel. She also currently stars in Harry Loves Lisa, a new TV Land reality series which chronicles her life with husband Harry Hamlin.
The Celebrity Apprentice's fourth season is scheduled to premiere on NBC early next year.
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