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Helio Castroneves

Penske RacingChelsie Hightower
Claim to fame: Race car driver, Season 5 champ Last seen on: Season 5 in 2007 Standout moment: Castroneves and partner Julianne Hough, above, wowed the audience with a high-scoring mambo (27 out of 30 points from the judges), making the racer an early favorite. Hough received an Emmy nomination... A.J. Mast / Associated Press