Credit: Noel Vasquez/GC Images

The countdown to the Kutcher-Kunis baby begins! Even with a certain fashion magazine cover still generating some heat, Ashton Kutcher and Mila Kunis pretty much owned the Internet on Monday, March 24 as fans celebrated the news that the recently-engaged couple are expecting their first child together.

"They are happy, healthy and excited to start a family," one source close to pregnant Kunis, 30, and Kutcher, 36, tells Us Weekly.

Although the couple's engagement was quietly confirmed just last month, the baby news doesn't change anything, with a second insider noting that the couple will wed following their child's arrival.

"There is no rush to get married," the first source concurs. "The wedding will be very intimate and private."

Two and a Half Men star Kutcher is gearing up for fatherhood, and turned to another That 70s Show pal for advice: Danny Masterson, who welcomed daughter Fianna with wife Bijou Phillips last month. "He asked Danny how it felt to be a dad, if he felt ready. They've been talking about play dates!" the source says.

And Kunis "is all about being a mother," the insider adds. No word yet on the little one's due date. Click here to see more pics of her bump.