They even made one for Fionna and Cake, too! (PS. Prince Gumball's voice can totally make my day-though Du might be offended if you're a huge PG fan...)
This is a cute song I found on Youtube so I AM NOT THE ONE SINGING! This IS the girl whos video was in the commerical and I thougth her voice was very good! Lyrics in the Kommentare box! P.S. Soory if someone already uploaded this!
