Jessica Simpson has joined NBC's upcoming reality series Fashion Star as a celebrity mentor.

Jessica Simpson will join host Elle Macpherson on the reality series, which will see 14 unknown designers compete for the chance to win a multimillion-dollar contract to launch their lines in three of America's largest retailers. Buyers from the three retailers serve as judges.

"Jessica Simpson has built an incredible fashion business and is a perfect mentor to our aspiring designers," said Ben Silverman, CEO and founder of Electus. "She will complement the buyers, Elle Macpherson and amazing format."

No premiere date has been set.