Former Grey's Anatomy star Kate Walsh celebrated her 40th birthday in style Saturday, welcoming co-stars past and present to Parc Lounge in W. Hollywood.

The Private Practice actress was joined by Grey's Anatomy friends Sara Ramirez and Justin Chambers (along with his wife, Keisha), along with her current Private co-star, Taye Diggs and his wife Idina Menzel. Some photos:

Click here for more pictures of Kate Walsh, Sara Ramirez and Justin Chambers at Kate's big 40th birthday bash! Looks like they all had a lot of fun.

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