Margot Robbie has recalled the one question that it took to convince John Cena to join the cast of Greta Gerwig's Barbie. The pair reportedly ran into each other at a restaurant, where Cena had paid for Robbie's bill, so she decided to shoot her shot. "He was shooting at (Warner Bros Studios) Leavesden where we shot the film as well and I was like, ‘That’s where we’re shooting Barbie’", she recalls. "I was like, ‘Do you wanna come be a Merman in Barbie?’ He was like, ‘Uh, yeah’ and I was like, ;surely he’s not gonna agree to it just like that.'" Click here to sign up for our newsletters