Mila Kunis is still adjusting to her post-pregnancy curves.

Mila Kunis at 'Jupiter Ascending' LA Premiere

Mila Kunis at 'Jupiter Ascending' LA Premiere

The 'Jupiter Ascending' star, who has four-month-old daughter Wyatt with fiancé Ashton Kutcher, admits "nothing fits" her straight off the runway anymore.

The petite beauty stunned in a black Dolce & Gabbana cocktail dress at the Los Angeles premiere of her new movie on Monday night (02.02.15), but said: "Let me tell you, having a baby and breastfeeding -- nothing fits in these dresses anymore. This is hard off a runway."

The 31-year-old actress currently has no new projects lined up and isn't sure how much maternity leave she will take.

Asked if she is ready to return to a film set, she told E! News: "I'm figuring it out."

Mila did all of her own stunt work in the new sci-fi film and claims it was more challenging than motherhood.

She said: "Hanging on a wire 17 hours a day for eight months gets exhausting. Hanging on a wire for 17 hours a day is way more exhausting because it's 17 hours, you don't sleep, you're bruised. You feel tired."

While she admits being a parent is tough as well, she added: "But you have a baby. You have a little being. There's nothing to have there, you're just killing yourself and you don't know what the final product is. Here, I have the final product in front of me."