English actress primarily active in television. Over the past couple of years, she has moved into films. She has previously been credited as Holly Grainger.
In May 2010, Grainger was named one of the 55 faces of the future in Nylon magazine's Young Hollywood Issue.
In 2011, Grainger became a series regular on the Showtime television series The Borgias, portraying Lucrezia Borgia. She also appears in a pair of 2011 films – Jane Eyre, playing one of the Rivers sisters opposite Mia Wasikowska and Michael Fassbender, and Bel Ami, alongside Robert Pattinson and Uma Thurman. In June 2011, Grainger was cast as Estella in Mike Newell's film adaptation of Great Expectations, opposite Jeremy Irvine and Helena Bonham Carter.