Hef Turns 75

By Stephen M. Silverman

09/04/1997 at 12:00 AM EDT

Monday will be a landmark day in sex and publishing: Playboy founder Hugh Hefner will turn 75. It will also be, reports Variety, the 11th birthday of his son, Marston. To celebrate both occasions, this Saturday in the Holmby Hills, Calif., Playboy Mansion, Hef is holding -- what else? -- a pajama party, where the guest list is said to include the publisher's seven girlfriends (but who's counting), daughter Christie and her husband Billy Markovitz. On Monday, however, the spotlight will be on Marston, who'll party with his young friends, his 9-year-old brother Cooper, and their mother, Kimberly -- who lives with the boys right next door to her ex, Hef, in a house that sits on an adjoining property with an open gate between.