According to The List and other media outlets, Millie Bobby Brown and Noah Schnapp have grown super close over the years, with each declaring the other a "best friend." If that wasn't enough, Brown once reportedly referred to Schnapp as "the greatest friend a girl could ask for" (via Seventeen). And the two have also been inseparable on set, with them regularly playing pranks on one another. 

"On our last day of filming Season 4, Millie, she got the whole crew together and she bought like, 2000 water balloons," Schnapp told People Magazine in October 2021. "Her and 30 other crew members came out behind the trailers with each, like, 100 water balloons, just chucking them at me!" According to Schnapp, this went down with hours left of filming to do. "The whole night, I was soaked. Dripping," he said. "The costumes [team staffers] were mad. They had to blow dry my whole costume."

After Season 4 of "Stranger Things" airs, Netflix reportedly plans to release one more season before ending the show for good. Schnapp explained during a recent appearance on "The Tonight Show" that he and Brown weren't handling the news so well. "I texted Millie...and she was like, 'You're crying, too? So am I,'" Schnapp said, describing his reaction to the February 2022 announcement by "Stranger Things" co-creators Matt and Ross Duffer that Season 5 would be the last. "I read it, and I was just bawling. I was so upset," Schnapp added. Season 4 of "Stranger Things" is due out on May 27.