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Appeared on the cover of three Francine Pascal books.
Grew up in Allentown, Pennsylvania
Put attending college on hold (it was to be Fordham University in New York) to film Mean Girls (2004).
Was considered for the roles of Regina and Cady in Mean Girls (2004). These roles eventually went to Rachel McAdams and Lindsay Lohan, respectively.
She began modeling at age 11.
Good friends with American Gun (2005) co-star Nikki Reed.
Correct pronunciation of her last name is "Sigh-Frid.".
In May 2008, she dressed up as "Alice" of "Alice in Wonderland" for a seven-page spread for Vogue Italia. That same month, she was also featured in the promotional poster for her movie musical Mamma Mia! (2008).
Originally auditioned for the title role on "Veronica Mars" (2004) but lost the part to Kristen Bell. Instead of playing "Veronica", she was offered the role of "Lilly", Veronica's dead best friend. She was so popular in this role, she was brought back more often than ever expected.
As a child model, she initially signed with Image International Agency in Allentown, Pennsylvania before working under Bethlehem's Pro Model Agency and eventually with Wilhelmina agency in New York.
Graduated from William Allen High School in Allentown, Pennsylvania in 2003.