As the birth of their baby quickly approaches, Mila Kunis and Ashton Kutcher are spending lots of time together and preparing for the big birthday of their first child together, E! News reports.

"Ashton is not letting Mila out of his sight," says an E! News source. "They are spending every moment together. He can't wait!"

Despite their excitement and eagerness for the baby to arrive, the couple continues to remain calm the E! news source added. And Kunis continues to attend prenatal yoga sessions with her friends.

"Mila is so excited about the baby," the E! News source continued. "She's not nervous at all. She's been really calm and chill about it all."

In addition to staying active and healthy, the parents-to-be have also kept busy by prepping the baby's room inside their $10 million mansion, WebProNews reports.

According to Us Weekly, the couple has also chosen to mostly hang around family since their friends are a bit rambunctious.

"She's [Mila Kunis] tightening the amount of people who come through their house," says an Us Weekly source. "Ashton has a group of guys who like to hang out -- and some of them can be a little much! So it's just close family and friends now."

Kunis has also persuaded her fiancé to "stop being such a daredevil" the source adds in reference to Kutcher's motocross accident in May. "With the baby coming, Mila wants Ashton to be a lot more careful."

Once Kunis and Kutcher's baby arrives, fans should also prepare themselves to see less of Kunis on the big screen.

During an interview with W Magazine, the brunette beauty revealed that she would opt to be a full-time mom once her baby arrives.

"To me, [acting] has always been a hobby that turned into a great profession, but I don't eat and breathe acting. But I'm excited about being a full-time mom. Although, give me a year of not working and I'll see how I feel," she said.

What are your thoughts on Mila Kunis and Ashton Kutcher's preparation process for their new child? Share your comments below.