Helio Castroneves will trade laps on the track for rounds on the dance floor, having joined the fifth season of ABC's Dancing with the Stars. Having won the Indy 500 twice, what other challenge was left? He'll be paired with Julianne Hough, the professional dancer who won the last season with Olympic speed skater Apolo Anton Ohno.

Castroneves' competition will include "Scary Spice" Mel B., Dallas Maverick's owner Mark Cuban, "Pretty Boy" Floyd Mayweather, Marie Osmond, Wayne Newton, and, um, Dr. Quinn Medicine Woman, Jane Seymour.

[Source: Indy Star]