Bill Cosby Hires MJ Lawyer In S3xual Assault Retrial

Bill Cosby just scored one of the best criminal defense lawyers to defend him in his sexual assault retrial ... Tom Mesereau.

Mesereau will be lead counsel in the retrial, set for November.

Mesereau has won some legendary cases. He repped Robert Blake, who beat the rap for allegedly murdering his wife Bonnie Lee Bakley. And he successfully defended Michael Jackson in the singer's child molestation trial.

It's said Bill and Camille Cosby both signed off on Mesereau.

His first appearance in the case will be today. Mesereau last month also spoke saying the retrial is a gigantic waste of time.