Joan & Melissa Rivers Prod at 'Project Runway'

Joan & Melissa Rivers Prod at 'Project Runway'

Joan Rivers and Melissa Rivers invade the judges table on the next Project Runway, and we have a racy clip from Thursday's episode!

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The stars of Fashion Police and Joan and Melissa: Joan Knows Best, the feisty mother-daughter pair are among the many celebrity guests appearing this season, including Emmy Rossum, Kristin Davis, Susan Sarandon, Bette Midler, Miranda Lambert, John Legend and Jordana Brewster.

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Project Runway airs Thursdays at 9/8c on Lifetime.