The 'Teenage Mutant Ninja Turtles' star revealed to ET whether Noah and Bodhi are excited for their little brother or sister.
Megan Fox confirms that she and Brian Austin Green are very much back on.
The 30-year-old actress is pregnant with the couple's third child, despite filing for divorce from Green, 42, in August. The two celebrated the rekindling of their relationship last month on a babymoon at the same place they first exchanged vows in 2010: Kona, Hawaii.
"I just really love it. It's a peaceful location. We go there a lot," Fox told ET's Carly Steel at the Teenage Mutant Ninja Turtles: Out of the Shadows junket on Thursday.
"It's all little bungalows and it feels more private and more island-like," she added. "You can spend a lot of time walking and exploring the island, and you don't feel like you're on a tourist retreat. And it's only five, six hours from L.A. instead of flying 14 hours, [so] I could handle the flight time."
WATCH: Pregnant Megan Fox and Ex Brian Austin Green Spotted Grabbing Lunch Day After Baby News
Baby No. 3 will join Fox and Green's two sons, 3-year-old Noah and 2-year-old Bodhi, and she says that her boys are ready to welcome a new baby brother or sister to the family.
"The older one is excited. Bodhi is too young," Fox said. "He gets it, but he's still in that sort of oblivious phase, like, 'What are we playing right now?' He's not thinking about the future. But Noah's really excited. He's actually really maternal, and he can't wait to feed and hold and pet the baby."
"He's practicing a lot with baby dolls," she added. "He's doing a good job."
Fox revealed that she already knows the sex of the baby – not that she's ready to reveal the news yet.
"I've had a baby almost every other year since 2012," she exclaimed, and hilariously noted that one thing not influencing whether she wanted another boy or a girl is passing on her wardrobe. "Well, my clothes would have to be in style in 20 years from now. I don't think she would want to wear my super moth-ridden clothes."
EXCLUSIVE: 'TMNT 2' Star Megan Fox Urges Parents to Get Kids Off Social Media: It's Toxic!
Despite billboards for the latest TMNT movie being plastered all over town and the previews constantly airing on TV, Fox says her kids don't really understand what she does -- and they won't be seeing either movie anytime soon.
"They're way too young to see the movie. Even if I wasn't in it, it would be too scary for them. But the scenes where April is being rustled and captured by the Foot Clan, that would be very upsetting to my children because they don’t understand that that's not reality," she explained.
"I did show them the trailer and Noah, my older one, was very quiet for a little while and said, 'Mommy, you can't be in that movie because the monsters might get you,'" she shared. "At that point, I was like, 'It'll be years before I sort of introduce them to any of this stuff.'"
Teenage Mutant Ninja Turtles: Out of the Shadows hits theaters on June 3.
When Fox's pregnancy news broke, she hilariously revealed which of her co-stars were #NotTheFather. Find out why the revelation came as "a big surprise" to Will Arnett in the video below.