Hugh Hefner: Deposed at Playboy Mansion in Cosby Case

Hugh Hefner got put under oath at the Playboy Mansion Wednesday in one of the Bill Cosby sexual assault lawsuits ... TMZ has learned.

We've learned Gloria Allred fired off a slew of questions to Hef in a lawsuit filed by Judy Huth, who claims Cosby got her drunk at a party at the Mansion when she was just 15, touched her vagina and then forced her hand down his pants.

Allred has been an adversary of Hefner's for a while, claiming he facilitated Cosby's alleged sexual abuse at the Mansion. Cosby has denied the allegations. Hef has been mum.