Shortly after David Ayer's Suicide Squad movie was officially announced, reports began to emerge that Warner Brothers had already approached a handful of actors for roles in the supervillain team-up. More specifically, we heard that Will Smith, Tom Hardy, Ryan Gosling and Margot Robbie were in negotiations. Now, it appears that those pieces are beginning to fall into place, as Collider reported late Sunday night that Robbie has joined the film as Harley Quinn.