Millie Bobby Brown is officially in mom mode.

The "Stranger Things" star was spotted for the first time with her adopted daughter just hours after shocking fans with her baby news.

Millie Bobby Brown and her husband, Jake Bongiovi, looked every bit the proud new parents as they strolled through East Hampton with a baby stroller in tow.

Millie Bobby Brown Debuts Adopted Daughter In East Hampton Stroll With Jake Bongiovi

In photos obtained by The Daily Mail, the actress, who went makeup-free for the coffee run, was seen carefully placing her baby into a car while Jake, the son of rocker Jon Bon Jovi, watched his wife with pride.

The sighting comes just hours after The Blast reported their bombshell announcement.

In the heartfelt Instagram post, the actress shared, “This summer, we welcomed our sweet baby girl through adoption. We are beyond excited to embark on this beautiful next chapter of parenthood in both peace and privacy. And then there were three. Love, Millie and Jake Bongiovi.”

Millie and Jake’s whirlwind romance began in 2021, and the pair announced their engagement in April 2023. They tied the knot the following year in a private ceremony, making headlines for their star-studded celebrations.

Now, just over a year into marriage, they’ve stepped into parenthood together.

Brown Reflects On Marrying Young

Becoming a new mom isn’t the only life-changing decision Millie has made at a young age.

The "Stranger Things" star recently opened up about her choice to marry Jake Bongiovi at just 20 years old, saying the move “just made sense.”

During a March episode of "Call Her Daddy," Brown told host Alex Cooper that after four years together, she knew Jake was the one once they moved in together and started building a life.

“We had dogs together, and we were taking care of our animals, and we started living this day-to-day life, and I thought, ‘Oh, I really don’t think I could ever see you as anything else. I don’t want to be with anyone else ever again,’” she recalled.

Millie Bobby Brown Says Jake Bongiovi Proposal 'Made Sense'

Brown admitted she wasn’t sure if Jake felt the same way until he proposed in April 2023. But once he did, she said it felt like “everything aligned.”

Adding to that certainty, Millie pointed out that both she and Jake grew up with strong examples of young, lasting marriages as her parents wed at 19, while Jake’s parents are high school sweethearts.

With that foundation, Millie said marriage felt natural, not rushed. “We had really great role models growing up, so we didn’t see any different," she said. "We didn’t get jaded by all the other stuff.”

Brown Explains Why Adoption Felt Natural

Even before becoming a mom, Millie made it clear she was ready to welcome a child into her life in whatever way felt right. While speaking on the "Smartless" podcast, the actress shared that her and Jake’s approach to family is rooted in love and openness.

“My home is full of love for anyone and anything, and so that is what we kind of stand by, Jake and I,” she explained. “Our energy in the house is the door is always open, and we want everyone to feel really comfortable.”

That outlook has made their decision to adopt feel like a natural next step, with Millie previously saying she doesn’t see any difference between raising a biological child and an adopted one. For the young couple, it’s all about creating a safe, welcoming space, and now their baby girl is at the center of it.

Millie Bobby Brown Opens Up About Future Plans With Jake Bongiovi

And back in February, in an interview with Vanity Fair, the "Enola Holmes" star doubled down, saying she and Jake are “pretty united” in what they want for their future.

“We talked about our political views, what kind of family we want to build, the kind of home we want to live in, the kind of relationship we’re looking for, the kind of careers we want," she said. "It’s such an important decision, and we wanted to make sure we were making the right one."