Hilary Erhard Duff is an American actress, singer, author, and businesswoman. She has received various accolades, including a World Music Award, seven Kids' Choice Awards, four Teen Choice Awards, and two Young Artist Awards.

Duff began her acting career at a young age, quickly becoming a teen idol as the title character in the Disney Channel comedy series Lizzie McGuire (2001–2004) and in the film The Lizzie McGuire Movie (2003). She appeared in numerous mainstream films such as Cadet Kelly (2002), Agent Cody Banks (2003), Cheaper by the Dozen (2003), A Cinderella Story (2004), and Cheaper by the Dozen 2 (2005). Duff later appeared in independent films like War, Inc. (2008), According to Greta (2009), Bloodworth (2011), and The Haunting of Sharon Tate (2019). She starred as Kelsey Peters in TV Land's series Younger (2015–2021) and produced/starred as Sophie Tompkins in the Hulu sitcom How I Met Your Father (2022–2023).

Her music career began with the Christmas-themed album Santa Claus Lane (2002). She achieved greater success with her second album, Metamorphosis (2003), which topped the Billboard 200 chart. Her subsequent albums include Hilary Duff (2004), Dignity (2007), and Breathe In. Breathe Out. (2015). She has sold an estimated 15 million records worldwide, and Billboard ranked her number 73 on their "Top 100 Women Artists of the 21st Century Chart" list.

In addition to her entertainment career, Duff has co-authored a trilogy of novels, beginning with Elixir (2010). She has ventured into business with fashion lines like Stuff by Hilary Duff, Femme for DKNY, and the "Muse x Hilary Duff" collection with GlassesUSA.