Who sang for Vera Ellen in the movie White Christmas?

Trudy Stevens (though she didn't get any credit for it)sanged when Vera Ellen did the dance with Danny Kaye "The Best Things Happen When You're Dancing" Trudy also did the numbers in "Snow" and "Gee, I Wish I Was Back in the Army".Rosemary Clooney, which by the way is George Clooney's Aunt, sang for both in the song "Sisters".