'The Suicide Squad' star Margot Robbie feels she's 'peaked' in Hollywood: 'This keeps me up at night'

At just 31 years old, the Australian-born actress has already co-starred alongside Hollywood’s top heavyweights including Brad Pitt, Leonardo DiCaprio, Jared Leto, Will Smith, Nicole Kidman, Charlize Theron, Christian Bale, Ryan Gosling, Steve Carell and many others.