Kellie Pickler and her Dancing With the Stars partner Derek Hough have a date tomorrow (Friday) -- on The Ellen DeGeneres Show

They'll talk about their quest to win the mirror ball trophy, and Kellie will also make a special announcement. 

In a recent issue of People magazine, Derek said that he's impressed with Kellie's ability. In turn, Kellie's thrilled to have Derek as her partner. She says, "My Grandpa Ken told me he was praying that Derek would be my partner, because he’s his favorite male dancer on the show. Now I think I will tell him to pray that we win!”