She wants a full house!

Mary-Kate Olsen is already a stepmom to husband Olivier Sarkozy's two kids, but she wants children of her own soon too, Us Weekly reports. The designer "really wants a baby" and "they have been ready to have a child for a while," a source dished to the mag.

The former child star, 30, and the French banker, 47, met at a party in 2012 and tied the knot in November 2015, so adding a brood would be the logical next step.

"They are so normal and super happy!" the source added.

The only obstacle to motherhood? Her nasty smoking habit! The pint size beauty loves to light up, and that's not the best thing when you're trying to get pregnant.