Margot Robbie just might be the busiest star in Hollywood these days. She’s now in the midst of shooting the lead character in Greta Gerwitz’s Barbie, a film about the iconic doll come to life. And she’ll soon be seen in four more soon-to-be-released productions: David O. Russell’s Amsterdam, Damien Chazelle’s Babylon, Wes Anderson’s Asteroid City,…