Celeb attorney Debra Opri, who once represted  Larry Birkhead, is suing him for defamation, fraud and breach of contract.

In the lawsuit, filed this afternoon in L.A. County Superior Court, Opri claims Birkhead slandered her during a recent appearance on “Larry King Live,” during which Birkhead said Opri had leaked confidential documents in his paternity case to Rita Cosby. Cosby wrote a book about the Anna Nicole saga.

In her lawsuit, Opri claims Birkhead ” … impugned both Opri’s ethics and her professional reputation.” Opri says Birkhead’s allegation that Opri was a source for Cosby’s book is untrue — “Birkhead never witnessed Opri handing confidential and private documents to Rita Cosby because it never occurred.”

Someone should have warned Birkhead to not make threats against a nasty celeb attorney.