Margot Robbie at an event for The Oscars (2016)
Third on this list last year, Margot Robbie makes the leap to the top as IMDb's Top Star of 2016. It was a year in which the Australian actress displayed her versatility in a trio of notable big-screen performances. She played BBC correspondent Tanya Vanderpoel in the war comedy Whiskey Tango Foxtrot (2016) and followed that with a turn as Jane Porter in The Legend of Tarzan (2016). However, Robbie's most notable work in 2016 was as psychiatrist-gone-bad Harley Quinn in Suicide Squad (2016). It's a memorable, visually striking role that not only inspired a future standalone film (Gotham City Sirens (????)) but too-many-to-count lookalike costumes at comic book conventions and Halloween parties.