I made cupcakes for my daughter's party (tomorrow). I frosted them with buttercream dream frosting. Should these be in the fridge? Did I mess up with frosting them too soon? Help!

yes

and u can easely frost em now no problem

No need to refrigerate. In the south a lot of people (me included) leave the dish of butter to sit on the counter for days, even a week if it lasts that long. Never once has it gotten rancid.

I agree, no fridge. They'll be fine.