George Clooney Returns To ER

George Clooney will shoot scenes this week on the Warner Brothers lot for one last episode of ER sources reveal exclusively to RadarOnline.com

The shoot is so secret that only a few cast and crew members will be allowed on set and cell phones will be banned while director John Wells films the hush-hush Clooney swan-song scenes.

In one scene, Dr. Doug Ross will be shown practicing at his new hospital in Seattle, while another scene will have him reuniting with the staff at County General in Chicago. Our source also reveals that the Seattle hospital set has been built, and is high tech and very "cool looking".

ER will end its 14 year run on NBC this spring.