In 2005, Haylie won the Teen Choice Award in the category of Choice Movie Breakout Performance - Female for her role in the 2004 film Napoleon Dynamite.
Haylie taught her sister, Hilary, how to ride her bike.
Haylie and her sister, Hilary, consider themselves as not only sisters, but as best friends.
Haylie used to like to help her mother out with her little sister, Hilary, when they were young kids.
As a young child, Haylie took ballet classes, along with her sister, Hilary.
Duff released her debut album Masquerade in 2008.
Duff wrote or co-wrote several songs on two of her sister Hilary's albums, Metamorphosis (2003) and Hilary Duff (2004).
Haylie, and her sister Hilary, watched and enjoyed 7th Heaven long before Haylie got a role in it.
During 2006, Haylie had an on-and-off relationship with Greg Carney, the club promoter in MTV's reality show Twentyfourseven.
Haylie has worked with her sister, Hilary, three times on movies and television. She's acted with her on Lizzie McGuire, The Lizzie McGuire Movie (but only had a minor role) and Material Girls.
Haylie had initially recorded a cover of Paris Hilton's song "Screwed", but this caused conflict between Haylie and Paris' respective labels. This led to Haylie dropping the song from her debut album prior to it's release.
Haylie was once briefly involved with Erik Von Detten, who starred in the movie The Princess Diaries and long-going soap opera Days Of Our Lives.
Haylie and Hilary appeared in a commercial for Ice Breakers gum.
Both Haylie and sister Hilary enrolled in online Harvard courses in 2005 so they could have an education but still proceed in traveling and working.
She and her sister covered The Go Go's hit Our Lips are Sealed a few years ago, and now the sisters have teamed up singing Madonna's Material Girl. It will be in the sisters' new movie Material Girls hitting theatres August 18, and it will be on a compilation CD Girl Next being released August 15.
Haylie is older then her sister Hilary by two years.
Haylie went on tour with her sister Hilary.
Haylie sang "A Whatever Life" for the Disney Channel Original movie, Stuck in the Suburbs (2004), starring Danielle Panabaker and Brenda Song.
Haylie wrote some songs for Hilary Duff's first album.
Haylie:(to Hilary, her sister) I will always be thankful for the family we have.
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