"Dancing with the Stars"' popular partners HELIO CASTRONEVES and JULIANNE HOUGH invade the ET stage today!

Helio, who is engaged to Cuban fashion designer ALIETTE VAZQUEZ, tells MARY HART that he has had to postpone the wedding, as there is just too much going on between the "Dancing with the Stars" rehearsals and his race driving.

"We postpone for a little bit, because everything is happening so quick. The championship is over, the dancing started, and, basically, I was, 'Ali, let's take it easy. Otherwise, we will be divorced before we get married.'"

And Julianne revealed that she will be teaching Ali how to dance, especially for the first dance at the wedding reception.

"Now, I want to dance with someone who knows how to dance," Helio admits.

"Dancing with the Stars" airs tonight at 8 p.m. on ABC.