Hugh Hefner has returned to Twitter.

The 90-year-old media mogul hasn't posted on the social media site for two months, but over the weekend he retweeted a post from his son Cooper Hefner, which featured them sharing a family moment at Thanksgiving.

Cooper had shared the picture of himself and his dad - who is married to Crystal Harris - along with his fiance Scarlett Byrne and a female family friend and wrote: ''Happy Thanksgiving all.''

The Playboy founder - who was wearing his trademark red robe in the picture while tucking into a bowl of soup - didn't add his own comment when he retweeted the image.

Hefner's last posting came in September, when he slammed speculation about his ailing health.

He quipped: ''I wish the tabloids had informed me a little earlier in the week that I'm sick.

''I might have cancelled my weekend plans.''

However, he hasn't been seen in public since May, and last month his ex-girlfriend Kendra Wilkinson-Baskett admitted she worries about his health ''every day''.

She said: ''Hef and I talked and saw each other actually a couple weeks ago.

''I'm not a medical person or any of that stuff...honestly he was there and we had a great talk and we were very happy to see each other.''

And iconic former Playmate Pamela Anderson recently admitted she finds it hard to see her pal these days because he is so frail.

She said: ''I remember when I first met him. He walked into the room and stole the show. It was beyond rock-star.

''Hef has always been a pioneer, setting the stage for all of us. When I saw him not too long ago, it was hard to see him in a walker.

''He's always been this strong person - and I know that he's still strong, but to see his body fall apart is hard.''

Last year, British glamour model Carla Howe claimed the entrepreneur 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.