When it comes to the best friendships in Hollywood, its hard to beat the likes of Ben and Matt or Tina and Amy . But a new adorable duo is making a play for cutest friendship of all: Millie Bobby Brown and Maddie Ziegler.

Brown made her first appearance on The Ellen DeGeneres Show Monday. The Stranger Things actress chatted about her role in the Netflix smash hit, her obsession with Leonardo DiCaprio and her budding friendship with Dance Moms star and Sia collaborator Maddie Ziegler .

Shes my best friend, actually, Brown told DeGeneres. We are very, very good friends.

News first broke of the pairs friendship last fall, when Ziegler, 14, interviewed Brown , 12, for Interview magazine. The two met backstage at So You Think You Can Dance in 2016. Like so many great friendships, their relationship began with tears.

The first time I met her, you know, Im such a big fan of Dance Moms and just of her in general. Shes so inspiring to me, Brown told DeGeneres. And so, when I met her, you know, obviously I started crying.

Ziegler sent Brown a private message on Twitter, and the rest, as they say, is history. Unfortunately, the friendship hasnt been all smooth sailing according to Brown, their first sleepover was a complete disaster.

Ive never been on a sleepover before, Brown told DeGeneres. So, I go over, and at 3:00 in the morning, the fire alarm comes on. We all had to get rushed out of her apartment building. Im crying because Im like My first sleepovers ruined! So, yeah, weve been through a lot.

Watch Browns interview with DeGeneres in the clip above.