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OTRC: Hugh Hefner turns 85, celebrates birthday with son, 21 (Photo)

Hugh Hefner and his son Marston appear in at their joint birthday bash at the Palms Hotel and Casino in Las Vegas on April 9, 2011. / Hugh Hefner and fiance Crystal Harris, as well as Playboy Playmate Anna Sophia Berglund about to jet off to Hefner's birthday bash at the Palms Hotel and Casino in Las Vegas on April 9, 2011. (twitter.com/hughhefner / yfrog.com/h32k7dqj / yfrog.com/h7n6kgpj)

Hugh Hefner and his son Marston recently celebrated their birthdays at a party at the Palms Casino Resort in Las Vegas - the Playboy mogul turned 85, while the younger Hefner is now 21.

The two, who share a birthday on April 9, were joined by Hefner's fiance Crystal Harris, 24, his other son Cooper, 19, Playboy Playmate Anna Sophia Berglund, 25, as well as at least 30 other Playboy models.

"Anna suggests that after all that cake we'll need a toilet," Hefner Tweeted before the event. " My girls are funny & make me laugh a lot."

He later said: "This Birthday Weekend was really one for the memory book. Too sweet."

Marston Hefner's and Cooper Hefner's mother is Kimberley Conrad, a former Playmate of the Year who was married to his father from 1989 to 2010. She is Hugh Hefner's second wife.

Hugh Hefner also a 58-year-old daughter, Christie, and a 55-year-old son, David, with first wife Mildred Williams.

Meanwhile, the Playboy mogul has another party to plan - his wedding to Harris. The two said in February that they plan to marry on June 18 at the Playboy Mansion in Los Angeles. They became engaged in December 2010.

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