“Rules of Engagement” star and “The Showbiz Show” host David Spade is rumored to be the father of Playboy Playmate Jillian Grace’s baby. But is it true?

Jillian Grace, the 22-year-old “Miss March 2005″ Playboy Playmate and David Spade have been linked in the past — now a pregnant Jillian Grace is claiming that David Spade is the father of her unborn child.

TMZ spoke with David Spade, who said, “I had a brief relationship with Jillian Grace. If it is true that I am the father of her child, then I will accept responsibility.”

Jillian Grace made her mark in the pages of Playboy after she did test shots for the Howard Stern show and was discovered for the men’s magazine.