Say it ain't so!
After 22 years as the host of the Late Show — it's time to bid David Letterman farewell!
[ Related: The Top Five Moments From David's Final Episode Of The Late Show! ]
And it seems we're not the only ones struggling with saying goodbye to the TV host.
This week, celebrities big and small took to Twitter and Instagram to say adiós to the icon!
And who's surprised?! The comedian has clocked in more than 6,000 broadcasts in 33 years while on television. WHOA!!
Since Dave couldn't have EVERY one of his former guests on during his final week, many were forced to say their goodbyes on social media — including Sia, Oprah Winfrey, Bette Midler, Jimmy Fallon, Betty White, Ellen DeGeneres, Conan O'Brien, Backstreet Boys, Maroon 5, Seth Meyers, Mindy Kaling, Foo Fighters, and Andy Cohen, just to name a few.
Ch-ch-check out their touching goodbyes (below)!