Mila Kunis will celebrate this Mother's Day as a mom-to-be.

The 30-year-old actress sat down with Ellen DeGeneres and opened up about her pregnancy and engagement to Ashton Kutcher for the first time.

"We actually were able to hide it [the pregnancy] for a very long time and it's amazing," she said. Although she wouldn't reveal her due date or whether she's having a boy or a girl, she admitted she has a name picked out.

She also fessed up to having cravings.

"Yes, I mean I'm very stereotypical. I eat sauerkraut all day long," Kunis said during the interview, set to air Friday, May 9. "This is the worst craving to have because sauerkraut smells and every time we open up the jar it just reeks in the whole kitchen. It's not like ice cream where everything smells lovely and floral."

Kunis and Kutcher have also been looking into birthing options.

"I'm gonna do it as all-natural as I possibly can, unless that there's an emergency or something that should go wrong," she said. She won't do an epidural. "I know, I'm crazy. I mean, I did this to myself. I might as well just do it right ... I wanted this. It's not like [anyone] made me do this."

As for her engagement, reports of which exploded in February, she said they were able to keep it a secret from the press for two months before the news actually broke. Then, in early March, outlets zeroed in on her huge engagement ring.

"I think everybody assumed we'd been engaged so long, that I was wearing the ring in public for two months and nobody commented on it in a single photograph."