There have been so many memorable Grey’s Anatomy guest stars over the years…and you likely forgot that some of these huge superstars were guests on the TV show at one point over the 18 season run!
Stars like Demi Lovato, Millie Bobby Brown, and Mandy Moore have all made cameos on the show.
We’ve rounded up some of the celeb names that you might have forgotten had guest-starring roles.
Click through the slideshow to see which celebs you forgot guest starred on Grey’s Anatomy…
