Once Upon a Time in Hollywood reunion looks set to be on the cards, with reports emerging that Margot Robbie will replace Emma Stone in an upcoming movie starring Brad Pitt.Emma Stone has been forced to bow out of period Hollywood drama Babylon due to scheduling reasons according to Deadline, with The Suicide Squad's Margot Robbie tipped to replace her alongside Pitt.Babylon – which will be directed by La La Land's Damien Chazelle – has been in the works for over a year and is currently set for