Shonda Rhimes celebrates 400 episodes of 'Grey's Anatomy'

"Grey's Anatomy" has crossed 400 episodes!

Producer Shonda Rhimes celebrated the milestone with a cake and posted it on Instagram.

"Never in all my dreams did I think I would create a show that would still be going strong 400 episodes later. Best fans ever. Thank you all," she said.

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"Grey's Anatomy" is a medical drama surrounding surgical interns and their supervisors.

The first episode aired in 2005 and there are currently 18 seasons. —JCB, GMA News