Celebs You Totally Forgot Guest-Starred on 'Grey's Anatomy'

Heather Matarazzo

Season: 11
The Princess Diaries actress played a pregnant woman who gets trapped and injured after a tunnel collapses. She and her fiance make it to the hospital, and she gives birth to a son.

Hector Elizondo

Seasons: 3, 5, 6, 7, 10
The Last Man Standing actor played Carlos Torres, Callie Torres’ dad. They argue about her life and he cuts her off from the family, but he eventually accepts her again and attends her wedding to Arizona.