Millie Bobby Brown, 19, wears bridal bra top for engagement party ...

Congratulations to the future Bongiovis.

Millie Bobby Brown celebrated her upcoming wedding to fiancé Jake Bongiovi with their families at an intimate party Thursday.

In a series of photos shared by hairstylist Pete Burkill, the happy couple poses in front of a white balloon arch and a neon sign spelling out “Mr. & Mrs. Bongiovi,” gazing at each other lovingly.

The “Stranger Things” star, 19, chose a two-piece bridal white Giambattista Valli lace set trimmed with pearls for the party and wore her brunette hair down in loose waves.

Bongiovi, 21, sported a green suit with wide lapels and added a simple white button-up shirt and black belt for the occasion.

The couple announced their engagement in April after two years of dating, shocking fans and drawing criticism; on social media, people called the star a “child bride” and “eleven,” in reference both to her age and her Netflix character.

But Bongiovi’s dad, Jon Bon Jovi, appears to approve of the young couple’s love.

“I don’t know if age matters,” the rock star told Andy Cohen on an episode of his Sirius XM show. “If you find the right partner and you grow together, I think that would be my advice, really, is growing together is wise.”

For more Page Six Style …

Bon Jovi, 61, might not be concerned about his middle child’s engagement, as he’s been married to his high school sweetheart, Dorothea Hurley, since 1989.

The aspiring actor proposed to the British beauty with a “super classic” round diamond ring estimated to cost anywhere from $75,000 to $150,000, according to experts.

If her engagement party is any indication, Brown’s bridal style is sure to be Gen-Z chic.