In the runup to filming, Greta Gerwig, Margot Robbie, and the rest of the "Barbie" team got into the Barbie zone with a Barbie sleepover. As Robbie told Vogue, the party was at Claridge's Hotel. One rule — the Kens were allowed to come to the party, but they weren't allowed to sleep over. After all, as Barbie herself says in the film, "Every night is girls' night." On "The Kelly Clarkson Show," Robbie confirmed the event "was as fun as it sounds." She continued, saying, 'It was Greta's idea; I can't take credit." Apparently, the women had the ultimate Barbie slumber party — sharing beds, ordering room service, and playing games. 

In an interview with BuzzFeed Celeb, Robbie explained how Ryan Gosling sent a very strange gift instead of stopping by. "Ryan couldn't make it and so instead, he sent a singing telegram for us." Robbie recalled answering the door to an older man wearing a kilt, who then performed a scene from "Braveheart" and played the bagpipes. "It was hilarious," she said. 

Robbie went on to explain how the cast also attended "movie church" every Sunday, where they would watch one of Gerwig's Barbie influences on the big screen. Was this a film or just a long party? Because we are super jealous!