For those not up on the details, Fusari’s lawyers filed a $30.5 million lawsuit against Lady Gaga in a Manhattan court last week, claiming, among other things, that his ex-girlfriend owes him royalties and his cut of merchandising profits.

On Friday, Gaga lawyered up and fired back with her own legal brief. The New York Daily News reports the countersuit accuses the New Jersey-based producer of rigging a contract she signed with him “in such a way as to mask its true purpose – to provide to the defendants unlawful compensation for their services as unlicensed employment agents.”

In keeping with the language of Fusari’s plainly vindictive suit, which called Lady Gaga both a “woman scorned” and a “guidette,” the producer’s lawyer responded to the countersuit with another insult, saying “Rob was no more of an ‘agent’ for her than she is a Roman Catholic nun.”

One person present at the genesis of Gaga’s rise to super-stardom who apparently isn’t looking for a way to tap into the big bucks now that she’s hit the big time is bassist Tommy Kafafian, who up until this year was part of the singer’s touring band.

Kafafian told The Star-Ledger that time in a courtroom facing his former boss is “really not his style” even though he hasn’t seen a dime yet for his part in writing “Disco Heaven.” The song didn’t make the standard release of Lady G’s 2008 debut The Fame but is available as a bonus cut on some versions.

Besides asserting that her 2006 deal with Fusari was “predatory and financially abusive,” Lady Gaga’s countersuit accuses him of preying on an “inexperienced performing artist” and seeks dismissal of the producer’s suit, plus damages.