Actress BROOKE SMITH obviously made quite an impression. After guest starring on just a few episodes of "Grey's Anatomy" as no-nonsense Dr. Erica Hahn, she's been brought back to become the show's newest series regular -- and ET is on the set of the hit ABC medical drama with the show's latest addition.

Brooke tells JANN CARL she had no idea that her brief appearance on "Grey's" would eventually lead to a full time gig. "It's one of those things where I wouldn't allow myself to think that it would happen because I would just be disappointed," says Brooke.

But now that it has, Brooke and her family have packed their bags and relocated from New York to L.A., where the series is filmed.

"Grey's Anatomy" airs on Thursdays at 9 p.m. on ABC.