Hugh Hefner's weight has allegedly plummeted to just over six stone.
Hugh Hefner and Crystal
Sources close to the Playboy founder say the 90-year-old mogul is "supersick" and there are big concerns over his health.
One told the New York Post newspaper: "He looks like he is down to around 90 pounds and supersick. His people are really trying to keep this under wraps. You even have to sign a confidentiality agreement to go up to see him."
Hugh hasn't been seen in public since May and although he tweeted a picture of himself from his 'Midsummer Night's Dream' party in August, he was reportedly absent from the bash.
Instead his son Cooper hosted the event.
Last year, British glamour model Carla Howe claimed Hugh - who is also known as Hef - was too sick to take part in his famous hedonistic parties.
She said: "Hef is so frail, he goes everywhere with a group of nurses."
She added that he "never leaves home" and goes to bed at 7pm after watching old movies.
However, a spokesperson for Hugh - who is currently married to 30-year-old Crystal Hefner - insisted he is fine.
They said: "Hugh Hefner is fine. It is no secret that over the past few years he has suffered with back pain that has made it a bit more challenging for him to get around, but at 90 years of age he is enjoying his life and still very involved in the day-to-day activities of editing the magazine."
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