Lexie Grey is the daughter of Thatcher and Susan Grey (who passed away at the end of Season 3), and thus the younger half-sister of Meredith Grey. She also has a younger sister, Molly Grey Thompson.

Lexie is a graduate of Harvard Medical School.

At the end of Season 3 of Grey's Anatomy we learn that Lexie Grey will be a new intern at Seattle Grace. She was introduced in the penultimate episode of the third season as a woman Derek Shepherd met at the Emerald City Bar.

In the season finale, Derek confessed to Meredith that he met another woman (although he still doesn't specify who) and when she asks if she should be worried, he confirms her fears. While he didn't get together with Lexie, Derek admits meeting her was the highlight of his day.

Lexie Grey later made her first appearance in Seattle Grace when she introduced herself to George O'Malley, who was cleaning out his locker as she was on her way in. Upon hearing the name Lexie Grey, George clearly realized her connection to Meredith. What's to come of this new intern?

Lexie Grey Quotes

Cristina: Follow!
Lexie: We're not gonna round?
Cristina: Carnage trumps rounds. Three. Write that down. Carnage always trumps rounds.

Cristina: I have five rules. Memorize them. Rule number one, don't bother sucking up. I already hate you, that's not gonna change.
Izzie: Traumas protocol, phone lists, pagers. The nurses will page you, you answer every page at a run. A RUN! That's rule number two... You're supposed to follow me!
Alex: The first shift starts now and lasts 36 hours. You're grunts, nobodies, the bottom of the surgical food chain. You run labs, write orders, work every second night until you drop. And you don't complain.
Meredith: On call rooms. Sleep when you can, where you can. You know, but not with anybody. Not attendings, especially not attendings. Sleeping with attendings, not a good idea. Where was I?
George: Er, rule number three. If you're sleeping, do not wake you unless the patient is actually dying.
Cristina: The dying patient better not be dead when I get there, because not only will you have killed someone, you will have woken me for no good reason. Are we clear? Yes?
Lexie: That was four rules. You said five.
Cristina: Rule number five. When I move, you move... Go!

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Grey's Anatomy Quotes

[walking by Izzie's room]
Meredith: Hot.
Sadie: Horny.

Sexual sorbet? Hahaha! I love it.

Bailey