Julianne Hough postponed Her Wedding to Ex-fiancée Zach Wilson

Not only is Helio Castroneves the new winner of "Dancing With the Stars" -- he's also a newly single man. Castroneves told entertainment news show "Extra" on Wednesday that he has split from his fiancée, Aliette Vazquez. There's speculation that the breakup may have been caused by a budding romance between Castroneves and his "Dancing With the Stars" partner, Julianne Hough. The two shared a kiss on Tuesday night's show.

Earlier in the season, the racing star pushed back his engagement. If there is something brewing between Castroneves and Hough, it wouldn't be the first time "Dancing With the Stars" has sparked an on-set romance -- or an off-screen obstacle.

Hough was engaged to Zach Wilson and originally planned to marry on August 8, 2007 but has postponed her marriage. Hough postponed her wedding to ex-fiancée and fellow dancer Zach Wilson because she was too busy preparing for the upcoming season of the show.

Zach Wilson since has listed his profile as single on his MySpace site. She has also been romantically linked with Kevin Connolly of Entourage fame, who recently gave her a diamond ring and admitted that he is "actively pursuing" Julianne, although Julianne denies a romantic relationship.