The 37-year-old American actress hinted to Stellar magazine she wants to be a mum-of-two before tying the knot with her beau.
The "Marie Antoinette" star admitted: "We want another child and I don't want to be pregnant at the wedding!"
Admitting she and Jesse, 31, "don't know when" they're going to wed, the star went on to confess parenthood has given the couple a whole new perspective on life, after they welcomed son Ennis, who is now 18 months old.
"After a child, everything else disappears - what matters most is them," Kirsten reflected.
The comments come after Kirsten was forced to deny she had secretly married Jesse, after the couple referred to each other as "husband" and "wife" when she was awarded a star on the Hollywood Walk of Fame back in August.