Aside from being Hilary Duff's sister, Haylie Duff has made a great name for herself as a trendy pop singer and an actress with great potential. Born in Houston Texas on February 19, 1985, she resides with her family and upholds the family convenience store business. She appeared in her sister's show Lizzie Mcguire and also on other programs like That's So Raven, Joan of Arcadia, American Dreams, Boston Public and Chicago Hope. She is also known for her role of the preppy Summer Wheatley in the cult classic Napoleon Dynamite. Her most recent and most popular emergence is on the TV show 7th Heaven as Sandy Jameson. On 7th Heaven, Sandy Jameson is the best friend of Simon Camden's girlfriend who gets pregnant with Martin Brewer.