Grey's Anatomy is no stranger to milestones at this point, but this is a pretty big one.
Tonight, the show officially surpasses ER's episode count and becomes TV's longest-running medical drama with 332 episodes, a record the cast is still surprised they've managed to break. Ellen Pompeo is especially surprised.
"It's incredible that I'm still here," the star told E! News when we visited the set. "What's the most interesting thing about it is it's the complete opposite of what I thought I would do. I've said it a million times, it's been printed a million times that I didn't want to do a medical show, I didn't want to get stuck on a show five seasons, I was like no way could I do five seasons ever. It's just interesting how your life evolves."