Mila Kunis Gushes Over Her Post-Baby Body

— -- Giving birth to her daughter changed Mila Kunis's life.

It changed her body, too.

"Boy do these things grow!" she told Conan O'Brien of her breasts. "I don't know how to deal with them because I've never had them. ... I'm like, 'Check it out!' This is amazing to me. It's a whole new world."

Kunis, 31, and her partner, Ashton Kutcher, 37, welcomed Wyatt Isabelle on Sept. 30. Having a baby, she told O'Brien, is "the greatest thing that's ever happened to me," though it has required her to buy a new wardrobe.

"First off all, I needed to start wearing bras," she said. "I always dressed for a flat-chested girl and, all of a sudden, I'm busty!"