Megan Fox’s expansive family tree is getting bigger.

While the Transformers star announced she is expecting a baby with fiancé Machine Gun Kelly Nov. 11, she’s already a mom to kids Noah, 12, Bodhi, 10, and Journey, 8, whom she shares with ex-husband Brian Austin Green. And it’s a role she’s embraced from the very beginning.

“It’s fertile soil,” she told the Washington Post in 2021. “It’s given me the ground that I needed to grow into something quite special.”

After she and the Beverly Hills, 90210 alum split in 2020, he went on to date former Dancing with the Stars pro Sharna Burgess, with whom he shares 2-year-old son Zane. The couple—who announced their engagement in September 2023—often share glimpses of their blended family, which also includes Brian’s son Kassius, 22, with ex Vanessa Marcil.

Megan, meanwhile, has opted to keep her kids off social media in recent years to shield them from negativity.

“I can’t control the way other people react to my children,” The 38-year-old explained to Glamour UK in 2022. “I can’t control the things that other children—that they go to school with—have been taught and then repeat to them. That’s also why I don’t really put my children on Instagram or social media.”

As for MGK—whose real name is Colson Baker—he’s already a father to Casie, 15, with ex Emma Cannon. And he’s been outspoken about how important their close bond is to him. 

“I was just walking behind my daughter in the airport the other day,” MGK, 34, told Drew Barrymore on The Drew Barrymore Show in 2021, “and she just has this walk, it's this pure bounce. She's so excited for life. Like, she's so young in her life, and I've experienced so much in my life. I just pray to every God that exists that she keeps that bounce forever and that no one interferes with that.”

Which is why when it comes to raising blended family, this pack of parents abide by one golden rule.

“The number one," Brian, 51, told E! News in April, "is always make sure that everything is centered around the experience of the kids.”

For the Anger Management star, that often means picking his battles.

“The person that you were with that you're now separated from, you guys are separated for a reason,” he continued, “because you didn't get along. So, you can't expect to then get along after the fact in raising your kids. So, you have to decide, ‘OK, it's not about us getting along anymore. It's about us co-parenting, which is a totally different situation.’”

Sharna, 39, has also praised Brian and Megan for their ability to put their kids first, telling the Not So Hollywood podcast in April 2023, “Honestly, the relationship is great.”

“We do a great job of co-parenting,” the dance pro went on, “and we have fun with it as much as we can. I think there's this weird, archaic idea that exes can't be friends, and co-parenting has to be hard.”

For a closer look at this blended family, keep reading.

Brian Austin Green enjoyed a lazy morning snuggled up with kids Noah, born in 2012, Bodhi, born in 2014, and Journey, born in 2016, who he shares with ex Megan Fox.

After Brian and Megan split in 2020, the Beverly Hills, 90210 alum found love with his Dancing with the Stars pro partner Sharna Burgess. The two welcomed son Zane in 2022, and announced their engagement the following year. 

Sharna sharing a tender moment with Zane and his older siblings. 

Meanwhile, Machine Gun Kelly—whose real name is Colson Baker—welcomed daughter Casie with ex Emma Cannon in 2009. He went on to get engaged to Megan in 2023.

Despite her commitment to co-parenting, Megan has said it's not always a walk in the park. “It’s hard to not feel obligated to be with them all the time or to constantly feel like I’m not doing a good enough job,” she admitted to Glamour UK in 2022, “but I’m also separated from their father. So, I can only have them half of the time. That just is what it is.”

Brian's blended family includes his son Kassius, 22, whom he shares with ex Vanessa Marcil. The actor posed with Sharna and all five of his kids for a festive family photo in December 2023.

For Megan, motherhood keeps her grounded. "When I step back, I know how connected I am and I’ve always been and how present I’ve always been,” she told Sports Illustrated Swimsuit in 2023. “I see the reflection of the type of mother that I am in their eyes and in their behavior."

In 2022, the Jennifer's Body star posted a rare photo alongside the "Emo Girl" singer and his daughter, taken at his 27 Club Coffee shop in Ohio.

The hitmaker turns to his daughter for advice on his music. "I trust her opinion more than I trust my own now," he said on The Kelly Clarkson Show in 2021. "Like, she has her finger on the pulse of what's hot, or if I'm doing a song and it's the right one, she'll confirm it."

In honor of Mother's Day 2024, Brian paid a loving tribute to Sharna. "You are an incredible mother and fiancée," he wrote on Instagram, "and we all love you to death."

Megan rarely features Journey and his siblings on social media—for one very good reason. "I knew when they were very young, I wanted to try to protect them however I could, especially limiting their exposure to the internet," she told Glamour UK in 2022. "So far, we’ve done a really good job and we maintain their innocence in a lot of ways, but I know I can’t protect them forever."

Brian's golden rule for co-parenting? Picking his battles. "People make a mistake of thinking that they're gonna do things so the separation doesn't affect the kids," he told E! News in 2024. "Of course it's gonna affect the kids. The only choice you have is how it affects the kids."

Likewise, Megan makes a point not to speak ill of her kids' father around them. "I don't let anything in my energy like that when I'm around my kids," she said on The Drew Barrymore Show in 2023, "because if I don't accept and love their father, I'm rejecting a part of them, because he's a part of who they are always.

Brian snapped a pic of his brood having some fun in the sun in Malibu, captioning the Instagram post, "Great day!!"

MGK—pictured with Casie at the Kids' Choice Awards in 2019—credited his daughter with helping him get clean after she told him she knew when he was high. "That was step one for me," the musician, who has been sober since August 2023, said on the Million Dollaz Worth of Game podcast. "As a father and as a man, to be the father I wish my dad would have been, I have to break this generational curse for my kid."

Sharna has thanked Brian's kids for preparing her to be a mom. "I got to test out motherhood with these guys," she said on the Quite Frankly podcast in 2023. "I got to learn things and grow with them, about parenting and understanding kids ... and knowing, 'Oh my God, I think I can be really good at that.'"

In 2020, Brian was a celebrity contestant on The Masked Singer. "I was super excited for my kids to watch it with me," he wrote on Instagram, but "they fell asleep after 15 min."

No job is too big for the TV star and his mini-mes.

While Brian revealed he got a vasectomy eight weeks after Zane was born, that doesn't mean he couldn't have it reversed down the road. "If we have the space and the ability to, would we love to? I certainly would," Sharna said on the Oldish podcast in January. "But we do have four young kids in the home and life is very, very busy."

For the latest breaking news updates, click here to download the E! News App