As if Madonna didn't have enough to stress about this week. The 'Give Me All Your Luvin'' singer has her much-hyped Super Bowl performance to look forward to tomorrow (Feb. 5), and now she has an issue that may distract her from her rehearsals. The creator of the infamous 'Girls Gone Wild' video series, Joe Francis, is threatening to sue Madge if she sings her new track 'Girls Gone Wild' during her halftime show.

E! Online reports that Francis shot over a cease and desist letter to the Material Girl, as well as to NBC Universal and NFL Commissioner Roger Goodell. What spawned the move? The iTunes presales of her new album, 'MDNA,'  shot to No. 1, and the song in contention is the No. 1 track on the record.

A letter obtained from Francis' lawyer, David Houston, read, "Mr. Francis and 'Girls Gone Wild' have worked tirelessly for an excess of two decades to build his brand and to protect his trademark Girls Gone Wild' ... 'Girls Gone Wild''s trade identity and trademark are extremely valuable assets which my clients protect vigorously."

Further, the letter claims that Madge outright ripped Francis off, claiming she "violated Federal and State trademark laws by making unauthorized use of Mr. Francis' trademark Girls Gone Wild in not only the title, but subject line of her various advertisements in order to lure potential consumers to purchase her latest musical effort."

However, based on the leaked set list, Madonna shouldn't have to worry about making a court date. That's good news for her -- she's already got headaches from Elton John and Lady Gaga's Little Monsters!