Britney Spears and Katy Perry may be multi-millionaires, but that doesn't mean they won't flip out when they feel that their hard earned dough is being taken from them!

They joined roughly 100 other artists that included Cee Lo Green and Maroon 5 in signing an open letter to Pandora. The letter protests the attempt from the music site to have Congress pass the Internet Radio Fairness Act, which would reduce the fees the internet radio service pays for playing artists' music.

What did the letter say exactly? Find out after the jump.