Duff was born in Houston, Texas on September 28, 1987. She is the second child of Susan Colleen (née Cobb), a homemaker and a film producer, and Robert Erhard Duff, a partner in a chain of convenience stores, who resides at the family home in Houston to maintain the family's convenience store business. She has an elder sister, Haylie Duff, who is also an actress/singer. Duff's early career was marked by playing minor roles, starting off with an uncredited appearance in Hallmark Entertainment's western miniseries True Women in 1997. She also served as an uncredited extra, in writer-director Willard Carroll's ensemble dramedy Playing by Heart in 1998. Her first major role was as a star of the 1998 film Casper Meets Wendy, a direct-to-video sequel to Casper: A Spirited Beginning in which she plays the young witch Wendy, who befriends the animated character Casper. The film was released to mostly unenthusiastic reviews. In 1999, Duff appeared in a supporting role in the television film The Soul Collector, which was based on a Kathleen Kane novel. Duff won a Young Artist Award for "Best Performance in a TV Movie or Pilot (Supporting Young Actress)" for her role in the movie. Lizzie McGuire, which first aired on the Disney Channel in January 12, 2001, was a ratings hit, drawing in 2.3 million viewers per episode. Her participation in the show led to her becoming highly popular among children between the ages of seven and fourteen, with critic Richard Huff of the New York Daily News calling her "a 2002 version of Annette Funicello". Duff's first role in a theatrical motion picture was in Human Nature (2002), an independent film shot around the time of the start of Lizzie McGuire. It was first showcased at the Cannes and Sundance film festivals. Duff's first studio album, Metamorphosis (2003), reached number one on the U.S. and Canadian charts and had sold over 3.7 million copies by May 2005. The lead single, "So Yesterday" (co-written and produced by The Matrix), was a top ten hit in several countries; its follow-up was the Laguna Beach theme song "Come Clean". The third single, "Little Voice", was not released in the U.S. and was a minor hit in Australia. In late 2003, Duff embarked on her first concert tour, the Metamorphosis Tour, and later the Most Wanted Tour. Most shows scheduled in the major cities were sold out. Duff has stated numerous times that she’s a strong animal rights supporter and has commented, when asked what she would be doing if she weren’t a celebrity, "I always wanted to be a veterinarian when I was younger, but then I figured out that animals actually die there, so that was not the job for me. Definitely something with kids or animals or something like that." In a June 2006 interview with Elle magazine, Duff was quoted as saying: "...(virginity) is definitely something I like about myself. It doesn't mean I haven't thought about sex, because everyone I know has had it and you want to fit in". Duff later told MuchMusic that she did not say the quotes attributed to her in the article and that the subject was "definitely not something that I would talk about..." She denied the quotes again in a 2008 interview with Maxim magazine. Duff began dating singer Aaron Carter in 2001. They met on the sets of Lizzie McGuire, during Carter's guest appearance in a Christmas episode. The relationship lasted two years. It was reported that Carter left Duff for Lindsay Lohan, but soon broke up with Lohan and resumed dating Duff. Carter later stated that he also cheated on Duff with her best friend, and that Duff "got her heart broken" and he was "sorry" for his actions. Duff began dating Good Charlotte singer Joel Madden in 2004. After a long period of tabloid speculation, Duff's mother Susan announced their relationship in a June 2005 interview for Seventeen magazine. Duff and Madden broke up in November 2006. The same year, Duff's parents separated after 22 years of marriage, due to infidelity on the part of her father. She wrote about the pain caused by the separation in her songs "Stranger" and "Gypsy Woman". Duff began dating NHL player Mike Comrie in 2007. On February 19, 2010, Duff and Comrie announced they were engaged.