Oops! I think...someone else wrote this.

i saw this site that said louis armstrong performed a jazz version of oops i did it again decades before britney did. it came with an audio recording, but i can’t find another source to verify this. did he do it first or not?

That one’s a Britney original.

This myth could’ve originated from the performance of one Richard Cheese ( http://en.wikipedia.org/wiki/Richard_Cheese )

You’re probably referring to this site. From their “First Time Here?” link:

So yeah. It’s a joke.

Did she actually write it herself?

Ha. No.

Looking at http://www.epinions.com/content_87806742148 … it appears the songwriter’s name is Max Martin.