PRODUCTION BEGINS IN LOS ANGELES ON THE FOURTH SEASON OF ABC'S CRITICALLY ACCLAIMED HIT SERIES "GREY'S ANATOMY"

Actress Chyler Leigh Joins the Cast as Meredith's Half-Sister, Lexie Grey

Production has begun in Los Angeles on Season Four of ABC's Golden Globe-winning series "Grey's Anatomy."

Entering their first year as residents, Meredith Grey, Cristina Yang, Izzie Stevens and Alex Karev now have interns of their own to mentor. Among the new interns are George, forced to repeat his internship after failing his exams, and Lexie Grey, Meredith's half-sister.

Actress Chyler Leigh joins the cast as Lexie Grey. Born in Charlotte, North Carolina, Leigh has worked with some of the biggest talents in the business, from Aaron Spelling ("Safe Harbor," "7th Heaven") to David E. Kelley ("Girls Club," "The Practice"). Her television and film credits also include "The 80s Show," "Reunion" and "Not Another Teen Movie."

"Grey's Anatomy" stars Ellen Pompeo as Meredith Grey, Patrick Dempsey as Derek Shepherd, Sandra Oh as Cristina Yang, Katherine Heigl as Isobel "Izzie" Stevens, T.R. Knight as George O'Malley, Justin Chambers as Alex Karev, Chandra Wilson as Miranda Bailey, James Pickens, Jr. as Richard Webber, Sara Ramirez as Callie Torres, Eric Dane as Mark Sloan and Chyler Leigh as Lexie Grey.

"Grey's Anatomy" was created and is executive produced by Shonda Rhimes ("Introducing Dorothy Dandridge"). Betsy Beers ("Casanova"), Mark Gordon ("Saving Private Ryan"), Krista Vernoff ("Law & Order") and Rob Corn ("Chicago Hope") are executive producers. "Grey's Anatomy" is an ABC Studios Production.