Barbie is missing a special stone from her crown -- it's the stone that gives Rainbow Cove its vibrant color. If she's not able to find it, the entire kingdom will become drab and gray.
Barbie and Chelsea are still on the hunt for the magic stone -- and so is Notto Prince. With the help of Barbie and the other Rainbow Princesses, Chelsea retrieves the stone just in time for Barbie's ceremony.
There's a royal concert in the clouds, and Barbie thinks Chelsea should sing a song for the grand finale. Chelsea loves to sing, but can she find the courage to perform in front of an audience?