Just when you thought the Grey's Anatomy cast had gotten as big as it could - it started with nine, then grew to include Kate Walsh, Sara Ramirez and Eric Dane - TV Guide is reporting it could be adding a new member.

Elizabeth Reaser, 31, is slated to guest star on the show this season, with the door left open for her joining the cast full-time.

She has a long list of TV and film credits (which you can view here), which include a starring role on the TNT medical drama Saved.

After graduating from Juilliard School of Drama, she struggled to find work at first, but landed a part on the daytime drama Guiding Light, and since has become an accomplished film, television, and stage actress, landing numerous supporting and leading roles.

What will bring this actress to Seattle Grace, and how long will she stick around? As usual, we'll have to wait and see.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.