Extra caught up with Katherine's former "Grey's Anatomy" co-star Patrick Dempsey at the Long Beach Toyota Grand Prix on Saturday and he spoke about her recent departure from the ABC medical drama after 6 years on the show.

Dempsey told interviewer Terri Seymour that it was "sad that she is leaving. She is a wonderful actress - beautiful, talented. She has got a couple of movies coming out and I wish her luck in those and we miss her. We'll see, maybe she will come back next year and guest star in a few episodes - who knows...I don't think there's any way you can replace her."

Via Extra's webcam, Katherine said, "Patty, I miss you. I saw you racing your cars, you look great. Wish I could see you more, buddy!"