Happy Birthday, Kate Walsh!
Kate with costar Patrick Dempsey on Grey's in 2011. (Photo Credit: Getty Images)
To celebrate Kate aka Dr. Addison Montgomery turning 48-years-old today, click through the gallery below to see the cast of Grey's Anatomy then and now!
Ellen — who received a Golden Globe nomination in 2007 for her portrayal of Meredith — continues to appear on the show today. The mom-of-three's notable film credits include Moonlight Mile, Old School, Daredevil, and Catch Me If You Can.