Kate Walsh's 40th Birthday Bash

The big 4-0!!!

Kate Walsh celebrates her 40th birthday bash with close friends at Parc Lounge in West Hollywood on Saturday night. The Private Practice star was joined by her former Grey’s Anatomy pals Sara Ramirez and Justin Chambers (and his wife Keisha).

Guests wore pins/badges of Kate as a little girl. What a girl Kate was!

Other pictures include Kate‘s Private costar Taye Diggs and his pigtails wife Idina Menzel.

Looks like Justin and Keisha caught a ride home with Sara!

10+ pictures inside of Kate Walsh, the 40-year-old birthday babe…