Now that we know Katherine Heigl is returning to Grey's Anatomy next season, she has a few words about her best friend and co-star, T.R. Knight, not coming back.

"It really pisses me off," she jokingly said of Knight's new endeavors.

Katherine also spoke to E! News about knowing she'd be back on the show last year and that T.R. would not, and how surprised she is that the show runners let those pieces of information out of the bag so soon. Frankly, we were wondering the same thing.

Heigl, whose new movie, The Ugly Truth, premiered last week, will be missing her BFF Knight, but has no inclination to follow in his footsteps and leave. For now ...

[video url="http://www.tvfanatic.com/videos/katherine-heigl-interview/" title="Katherine Heigl Interview"][/video]

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