<P> Alexandra Caroline `` Lexie '' Grey , M.D. is a fictional character from ABC 's medical drama series Grey 's Anatomy . Created by series producer Shonda Rhimes , the character was portrayed by actress Chyler Leigh from the third through eighth seasons . She was introduced as a surgical intern in season three . Serving as Meredith Grey ( Ellen Pompeo ) 's half - sister , Lexie transferred to the fictional Seattle Grace Hospital after her mother 's sudden death , and was eventually named a surgical resident . Leigh was originally contracted to appear for a multi-episode story arc , but received star billing in the fourth season . </P>
<P> Alexandra Caroline `` Lexie '' Grey , M.D. is a fictional character from ABC 's medical drama series Grey 's Anatomy . Created by series producer Shonda Rhimes , the character was portrayed by actress Chyler Leigh from the third through eighth seasons . She was introduced as a surgical intern in season three . Serving as Meredith Grey ( Ellen Pompeo ) 's half - sister , Lexie transferred to the fictional Seattle Grace Hospital after her mother 's sudden death , and was eventually named a surgical resident . Leigh was originally contracted to appear for a multi-episode story arc , but received star billing in the fourth season . </P>
when does lexie come on grey 's anatomy
when does lexie come on grey 's anatomy
season three
season three