Mila Kunis reveals how she lost the baby weight so quickly

It's been four months since Mila Kunis gave birth to her first child, daughter Wyatt. And she already looks like she's lost all of her baby weight.

So, how did she get her slim figure back so quickly? The actress explained her fool proof method to Jimmy Kimmel Tuesday night.

"Breast feeding is like working out," said Mila Kunis on "Jimmy Kimmel Live." "That, and it's true that I am very active, I hike almost every day with her."

"Oh, exercise, I didn't think of that," said Jimmy Kimmel.

"I strap her in a papoose, and away we go," said Mila.

Wow! And that's especially impressive considering how big baby Wyatt was when she was born back in October.

"She's a really good baby. She was 9.5 pounds when she was born. Yeah! Yeah! Uh huh," Mila said on "The Ellen DeGeneres Show."

And even though Mila admitted it's tough being away from Wyatt, we're glad she's out and about and making awesome movies again.

Her newest flick, "Hell & Back," is reportedly in post-production, and you can catch her in the sci-fi fantasy film "Jupiter Ascending" when it hits theaters Feb. 6. (Video via Warner Bros. / "Jupiter Ascending")

This video includes images from Getty Images.