But the 58-year-old enlisted in the help of one unforgettable performer to sing the theme song to the Pixar sequel!
On Friday's Ellen, the daytime host revealed that Sia would cover Nat King Cole's Unforgettable as the theme to Finding Dory!
And just like magic, the Cheap Thrills songstress was on hand to perform her version!
After belting out her dreamy rendition of the classic ballad, the Aussie singer admitted "Dory's story makes me teary."
We're with you on that one, girl!
Ch-ch-check out the clip (above) to see Sia perform the theme — and catch Finding Dory in theaters June 17!