Margot Robbie and Carey Mulligan on ‘Babylon’ Orgies and Why ‘Barbie’ Will Be ‘Everything You Dreamed Of’

Carey Mulligan and Margot Robbie know each other, having worked together on Emerald Fennell’s “Promising Young Woman,” which Mulligan starred in and Robbie produced through her company, LuckyChap Entertainment. So when they sit down to discuss their recent projects — Mulligan’s turn in “She Said” as Megan Twohey, the New York Times reporter whose investigative work with Jodi Kantor helped bring down Harvey Weinstein, and Robbie’s portrayal in “Babylon” of Nellie LaRoy, a self-destructive silent film star — it’s like watching two old friends chatting. During the conversation, Mulligan talks about getting to know Twohey, and Robbie gives insight into working with Damien Chazelle on the wild provocation that is “Babylon.” Naturally, Robbie’s upcoming summer film, “Barbie,” by way of Greta Gerwig, also comes up.