Madonna Threatened by 'Girls Gone Wild' Creator Joe Francis -- Don't You Dare Sing That!!!

Joe Francis -- the mastermind behind "Girls Gone Wild" -- is sending Madonna a cease and desist letter, threatening that he'll take legal action if she sings the song from her new album -- titled "Girls Gone Wild" -- at the Super Bowl.

TMZ has obtained the letter that Francis has sent to Madonna and her "co-conspirators." Francis' lawyer threatens to sue all of them for attempting to get a "free ride on the valuable consumer goodwill and brand recognition" of Joe's famous trademark.

Francis' lawyer makes it clear: "Your misappropriation of my clients' trademark will not be tolerated."

But Francis is willing to cut a deal with Madonna, provided she agrees to the following terms:

-- Negotiate an immediate licensing agreement for the use of Joe's trademark
-- Account for the number of times Madonna has already used the trademark
-- NOT PERFORM THE SONG AT THE SUPER BOWL

Joe thinks NBC and the NFL are conspiring with Madonna, so the letter went to them as well.

Joe's lawyer is demanding a response by 5 PM PT today ... or else.