Hugh Hefner’s No.1 girlfriend Anna Sophia Berglund gets ‘him to plank’!

Looks like Playboy mogul Hugh Hefner is leaving no stone unturned to keep his new girlfriends happy after he was dumped by his former fiancee Crystal Harris.

A picture has emerged showing the 85-year-old making a half-hearted attempt at planking, reports the Daily Mail.

In the picture, he can be seen wearing black silk pyjamas, lying at one end of the table, with his head facing the camera, at his famous Playboy Mansion in the Holmby Hills, Los Angeles.

Dirty plates and glasses can be seen at the other end of the table.

Hefner``s new “number one” girlfriend Anna Sophia Berglund - who also happens to be Harris’ best friend - posted the picture on her Twitter account, saying “I got Hef to plank!”.

In another picture, Hefner’s Playboy bunnies have a go at the fad.

The girls included Berglund, Hefner’s "second" girlfriend Shera Bechard, Miss January 2010 Jaime Edmondson, Miss March 2009 Jenn Pershing, Miss October 2010 Claire Sinclair, and Playboy models Trisha Frick and Cristal Camden, who was one of Hef`s seven girlfriends in 2003.

They are lined up alongside one another on the table, with the used plates having been cleared, and Hefner can be seen behind them pulling the thumbs up.