All buttercream with fondant details, the red sparkly shoes were made out fondant, dried for a day and then used sugar glue to attach the red disco dust.
The rainbow is made out of fondant, I used Sharon Wee from Wee Creations tutorial for the rainbow, I did add support as it was a large rainbow.

Any questions about how I made the cake just ask :-)

I used non-crusting buttercream