There's only one way to describe Julianne and Derek Hough's performance on the Disney Family Singalong: supercalifragilisticexpialidocious. On Sunday night, the brother-sister duo, along with Derek's girlfriend Hayley Erbert, sang and dance to "Step in Time" and "Supercalifragilisticexpialidocious" from the hit Disney musical Mary Poppins. From their costumes to their choreography, the number was practically perfect in every way.

The trio previously showed off their Disney spirit when they performed "Be Our Guest" from Beauty and the Beast [1] for the first singalong. Just like last time, the special helped raised money for Feeding America and included even more stars including Idina Menzel, Ben Platt [2], Halsey [3], Shakira [4], and Josh Gad. Watch the Mary Poppins number above.