The biggest addition to the cast of Grey's Anatomy in Season Four is the cute Chyler Leigh, who plays Lexie Grey, sister of Meredith Grey. We're looking forward to seeing where this character is headed.
Derek: I am calling post-it, Zola, Bailey, the tumors on the wall, ferryboat scrub caps. I thought D.C. was everything. I was wrong. You... you're everything. I love you and I'm not going to stop loving you. I can't live without you. I don't want to live without you, and I'm going to do everything in my power to prove it. Meredith: I can live without you, but I don't want to. I don't ever want to.