Look, we know it's only been three years since Stranger Things burst into the pop culture ether in 2016, but it's pretty crazy just how much the kids of the Netflix hit have grown up since then! Click through the gallery to take a look back before season three premieres on July 4.
'Stranger Things' Cast: Then
Let's take a look back at what all of the younger cast members of Stranger Things looked like at the Netflix hit's premiere in July 2016, shall we? (This pic, BTW, is of Gaten Matarazzo, Noah Schnapp, Caleb McLaughlin, Millie Bobby Brown and Finn Wolfhard with their co-star, Natalia Dyer, during a press day in August 2016, one month after the show premiered on July 15, 2016.)
Millie Bobby Brown
The British actress was 12 when the show premiere, and she looked like a little princess in a white dress with embroidered details that was reminiscent of a flower girl dress. Back then, she still wore her hair short, as it was growing out from shaving her 'do to play Eleven.
The then-13-year-old Jersey native flashed his now signature grin. Gaten rocked a charcoal gray suit on the red carpet, along with a navy blue button-down and black sneakers, but it was his adorable curls that nearly stole the show!
His character started it all! The youngest of the Stranger Things kids, Noah was just 11 at the premiere, but he looked far happier than his poor character, Will Byers, did when he got stuck in the Upside Down (we mean, duh...). The New Yorker looked older than his years, however, in a gray blazer, white button-down and dark jeans, which he accessorized with a blue-and-orange striped tie and smoke-hued sneakers.
Then 14, Caleb looked very dapper in his gray suit and bow tie.
The Canadian actor was not at the Stranger Things season one premiere, but the then-13-year-old did walk the red carpet three months later at the Shin Godzilla premiere during New York Comic Con, looking sharp in a blazer for the occasion.
'Stranger Things' Cast: Now
These teenagers have grown up so much in just three years! Here's what they look like now, just ahead of the season three premiere on July 4...
Millie Bobby Brown
So grown up! Millie has become a budding fashionista and is a regular presence at fashion week shows. In fact, she made an especially stunning turn recently in a beige strapless gown at the Godzilla: King of the Monsters premiere in London in May 2019. (And that heart bag! Swoon!)
Gaten has been having a ball doing press for the Netflix show's third season -- he even made finger hearts while in Seoul, South Korea, in June 2019.
Noah suited up in polka dots for the 2019 MTV Movie & TV Awards in June -- and his smile was as big as ever!
So trendy! Caleb rocked a neon ensemble at the 2019 Kids' Choice Awards in March -- and he looked like such a grown up!
Also at the MTV awards show, the curly-haired cutie showed off his unique fashion sense in a chevron-adorned black jacket and black-and-white striped pants.