Millie Bobby Brown turning 20 last year was already mind-blowing and a dose of reality that every child actor has to grow up ...

When Taylor Prokes opened her door to find a violinist in a ball gown, she had no idea the moment would become a viral TikTok ...

Millie Bobby Brown made a splash on her 21st birthday, fully embracing an under-the-sea aesthetic for the special occasion.

The "Stranger Things" actress went totally under the sea, with a themed look and cake for the milestone event.