They even made one for Fionna and Cake, too! (PS. Prince Gumball's voice can totally make my day-though 你 might be offended if you're a huge PG fan...)
This is a cute song I found on youtobe 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 评论 box! P.S. Soory if someone already uploaded this!