<P> Alexandra Caroline `` Lexie '' Grey , M.D. is a fictional character from ABC 's medical drama television series Grey 's Anatomy , portrayed by actress Chyler Leigh . Created by showrunner Shonda Rhimes , the character is introduced in season three as protagonist Meredith Grey 's younger half - sister , who has transferred to Seattle Grace Hospital as a new surgical intern after her mother 's sudden death . Lexie is eventually named a surgical resident in season six . Leigh was originally contracted to appear for a multi-episode story arc , but ultimately received star billing from seasons four to eight . Leigh has also reprised her role as Lexie on the spin - off show Private Practice . </P>
<P> Alexandra Caroline `` Lexie '' Grey , M.D. is a fictional character from ABC 's medical drama television series Grey 's Anatomy , portrayed by actress Chyler Leigh . Created by showrunner Shonda Rhimes , the character is introduced in season three as protagonist Meredith Grey 's younger half - sister , who has transferred to Seattle Grace Hospital as a new surgical intern after her mother 's sudden death . Lexie is eventually named a surgical resident in season six . Leigh was originally contracted to appear for a multi-episode story arc , but ultimately received star billing from seasons four to eight . Leigh has also reprised her role as Lexie on the spin - off show Private Practice . </P>
who plays meredith 's sister on grey 's anatomy
who plays meredith 's sister on grey 's anatomy
Chyler Leigh
Chyler Leigh