Greys Anatomy - Katherine Heigl Signs Contract for Grey's Anatomy Season Six

The cast lineup for season six of Grey's Anatomy is becoming clearer by the day.

Following on Marc Malkin's report last month that star T.R. Knight is leaving the series, a source confirms that Katherine Heigl "will be back."

But what's the official word from the show bosses and Heigl's people?

Reps for the hit ABC series and for Katherine Heigl both declined to comment.

Source: EOnline