By Michael Ausiello
Updated February 18, 2010 at 12:00 PM EST

Twilight bloodsucker Rachelle Lefevre has joined the cast of CBS’ Untitled Medical Drama from producer John Wells, sources confirm to me exclusively.

The project revolves around a team of medical professionals who travel the U.S. helping those in desperate need of assistance.

It’s ER on wheels!

Lefevre’s character, Katy, is described as a smart and confident medical road warrior who’s more comfortable working in the field than in the office. The cast also includes Amy Smart.

Lefevre is also known for her recurring roles on What About Brian, Boston Legal, and Swingtown.

PhotoCredit: Albert L. Ortega/PR Photos