Actor Ashton Kutcher, whose May-to-December romance with screen star Demi Moore has riveted the tabloids for months, is producing a Fox TV sitcom pilot inspired by the couple's recent real-life marriage. The show, about a man closer in age to his eldest stepdaughter than his bride, is ?loosely based? on Kutcher?s new blended-family life, with some key variations, 20th Century Fox Television spokesman Chris Alexander said.

Tentatively titled ?30-Year-Old Grandpa,? the comedy is set in Chicago rather than Hollywood, and neither of the two lead characters are entertainers. Instead, it centers on a 30-year-old nightclub owner and a fortysomething businesswoman who get married and discover they're expecting a child.

At the same time, the woman's 22-year-old unwed daughter announces she is pregnant and plans to move home to raise her baby ? turning the show's leading man into a grandfather overnight. The woman?s younger daughter, who had been living with her father, decides she, too, wants to live with mom and the new stepdad.

?It becomes a very modern, messy look at an extended American family,? Kutcher's producing partner, Karey Burke, told Daily Variety. Like the fictional club owner in his sitcom pilot, Kutcher, 27, became a stepfather when he tied the knot last month with Moore, 42, who has three daughters ? aged 11, 14 and 17 ? from her previous marriage to actor Bruce Willis.