It was last November when HELIO CASTRONEVES and JULIANNE HOUGH won the "Dancing with the Stars" championship. Since that time, Helio has been in Indianapolis dealing with the demands of his racing career, while Julianne has been in Nashville recording songs for her upcoming Mercury Records CD.

But on Friday, the two reunited when they joined the "Dancing with the Stars" tour for a couple of dates (January 18 to January 23), with two more coming up in February (Feb. 9 and 10) -- and ET was there!

"We were on the stage for an hour and he knocked it out," Julianne tells ET. "I think it is muscle memory because we danced together for so long."

For Helio, joining the tour in the racing city is exceptional. "I think this is special because it is Indianapolis," says the Indy champ. "It is a place I care about, and they seem to care about me -- and her, as well, because of 'Dancing with the Stars.'"