Tonight, David Letterman is celebrating 20 years on CBS.
August 30, 1993 marks the premiere date for "The Late Show" with Letterman.
To celebrate, Bill Murray — Letterman's first ever guest — will be on the show this evening.
If you wanted to be surprised, CBS has already spoiled Murray's big entrance with photos and video of the event on its website.
Murray will show up dressed as Liberace retrieving a time capsule to give to Letterman.
Check out Murray's grand entrance along with photos below:
Here's Murray getting the time capsule ...
... and presenting it to Dave.
