Mila Kunis and Ashton Kutcher Welcome 'Beautiful' Baby Girl

Mila Kunis and Ashton Kutcher are officially parents!

The actress gave birth to a "beautiful" baby girl on Tuesday in Los Angeles, a source tells The Insider With Yahoo. Kunis, 31, and her fiancé, 36, arrived at the hospital around 6 a.m. and welcomed their daughter later that night. Despite looking ready to pop for the last several weeks, Mila apparently delivered her bundle of joy right on time.

"Mila had a beautiful baby girl. She is healthy and Mila and Ashton are just thrilled," the source says, adding that there was no word on the name yet.

This is the first child for the couple.

[Related: Mila Kunis's Pregnancy Style]

The Ted star told Ellen DeGeneres in May that she and Ashton already had a name picked out — although the private star wouldn't reveal it — and also disclosed that she was planning on having a natural birth without epidural.

A ready to pop Mila Kunis attends her regular yoga class in L.A. (Splash News)
A ready to pop Mila Kunis attends her regular yoga class in L.A. (Splash News)

"The hospital that I'm going to be laboring in does a midwife, you know, doula type of thing," she said. "I'm going to do it as all natural as I possibly can unless that there's an emergency or something that should go wrong."

She joked: "I did this to myself, I might as well just do it right. I wanted this!"

It's a safe bet that Ashton was by Mila's side when she gave birth… just in a very specific location.

"Two people are allowed in my delivery room," she shared in the July issue of Marie Claire. "My doctor and my significant other. And he is staying above the action. He'll be head to head. Not head to vag. Unless he wants to risk his life and see. But I wouldn't if I were him. I highly doubt he wants to see that being ripped apart and shredded. Because it will be shredded. It's just a matter of how badly.

"Without being an asshole, I have to say, I love being pregnant," Kunis gushed to the mag. "I just don't want my kids to be assholes," she said. "I feel like so many kids nowadays are. Both of us just want to have well-behaved, honest, nice children who people meet and say, 'That's a good kid.'"

The couple hosted an intimate baby shower for Mila at their new home in Beverly Hills in late July. To accommodate their growing family, Kutcher put his bachelor pad up for sale and the duo purchased a more family-friendly mansion for $10 million. Kunis sold her bachelorette pad, too. Their new house is 7,351 square feet with three bedrooms and four bathrooms.

Plenty of room for three!