Mary O'Connor, Hugh Hefner's secretary at Playboy for more than 40 years, has died.
"Mary passed away today. We loved her more than words can say," Hef tweeted.
Girls Next Door stars Holly Madison, Kendra Wilkinson-Baskett and Bridget Marquardt all took to Twitter to offer condolences, as did Hef's new wife, Crystal Harris.
Holly wrote, "Rest In Peace Mary."
Kendra tweeted, "RIP Mary O'Connor. She was an amazing person who helped me through so much. But I know she's happy with her boo Captain Bob. :)"
"Thank you for all the sweet messages. Mary O'Connor will be missed. #RIPMary," Bridget posted in honor of the unofficial Mansion "house mother."
Crystal said, "Hef's long time secretary & my dear friend Mary O'Connor has passed away. It's a very sad day here at the Playboy Mansion. We love you Mary."
Mary was often seen on the shows Girls Next Door and Kendra, and was known to give the infamous L.A. party house the nurturing touch it needed.
Rest in peace, Mary.