Their conversation is pretty much a transcript of a phone call.
They talk about how they met and how Millie was a big fan of Maddie before they became friends.
Millie was born in Marbella, Spain but she has lived everywhere and she says that she lives on a plane because she travels a lot and she doesn't really lives anywhere right now, but her favorite place to live is Los Angeles.
She was born in 2004, which seems to surprise Maddie because she didn't know that.
She started acting when she was 9.
She thinks that you can go by instinct with acting and that you don't need to practice as much as with dancing.
They talk about Stranger Things and the whole experience doing the show.
If you want to read the whole interview, click H E R E.