Before many of your favorite stars became household names… they were on Grey’s Anatomy.
The beloved ABC series has been on the air since since 2005 – almost 15 years – and is currently about to kick off its brand new season TONIGHT!
We’ve rounded up 25 celebrities whom you might have forgotten had guest-starring roles.
Season 17 of Grey’s Anatomy returns in just a few hours on ABC. Be sure to check it out!
Click through the slideshow to see which celebs you forgot guest starred on Grey’s Anatomy…