David Harbour joined Millie Bobby Brown for Stranger Things star's birthday party Stranger Things star David Harbour reunited with castmate Millie Bobby Brown for her birthday celebrations. 23 February 2026 David Harbour was part of Millie Bobby Brown's birthday celebrations. David Harbour joined Millie Bobby Brown for her birthday celebrations The Stranger Things actress turned 22 on Friday (19.02.26), and she marked the occasion with an intimate party for family and some close friends at Maison Close in New York City's Soho district.