Margot Robbie talks with ET’s Kevin Frazier in Los Angeles at the best of ‘Babylon.’ The starlet jokes concerning the ‘Barbie’ trailer dripping online the day before its main release. Margot additionally shares her enjoyment for Lady Gaga playing Harley Quinn in ‘Joker: Folie á Deux.’ And also, she breaks down her Old Hollywood-inspired red rug ensemble. ‘Babylon’ strikes movie theaters Dec. 23.