Millie Bobby Brown's best friend is Maddie Ziegler.
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Millie Bobby Brown: 23 Facts You (Probably) Didn't Know About The Star Of "Stranger Things"
23. Millie Bobby Brown's best friend is Maddie Ziegler.
Millie's always been a fan of Maddie, but they became friends after Millie got to meet Maddie backstage. And when Maddie first met Millie, she hadn't even seen Stranger Things! America's Got Talent star Grace Vanderwaal is also part of Millie and Maddie's BFF squad.