David Letterman

David Letterman's finale on CBS' Late Show was ratings gold for the Network.

There were all kind of star-studded guests on the last The Late Show With David Letterman, but maybe the most memorable (and definitely the most classy) was not even on that show.

T-minus one week and counting until the very last Late Show with David Letterman and the tributes are coming faster and faster, and sadder and sadder. I hope on the last installment of Stupid Pet Tricks one of the tricks is a shih tzu shedding a single tear for the end of this venerable late-night franchise, which comes to a close on May 20. It’s only fitting.

Here are the top 10 reasons you should watch Letterman's final two weeks of shows.

Actress-singer Anna Kendrick is somewhat notorious for making filthy (hilarious) jokes on Twitter and is overall really charming. Her most recent appearance Tuesday night on CBS' "Late Show with David Letterman" only continued to make that the truth.

Since April we've known that David Letterman is leaving The Late Show sometime next year.

One of the most comforting moments for me in the aftermath of the terrible tragedy in 2001, was when David Letterman returned to CBS' 'The Late Show.'

"Summertime! Summertime, people!" Sure, Bruce Willis. We can blame this on it being the summertime. The actor hit 'The Late Show' last night to ... honestly, we don't even know, but eventually it devolved into Willis eating corn on the cob harmonica-style and getting absolutely covered in melted butter. It seems that Willis is a huge fan of corn -- can't get enough of it! -- and he was eager to share some corn-centric life hacks with host David Letterman.

From 2003 to 2006, Dave Chappelle's show on Comedy Central was an absolute hit. It was a sketch comedy show featuring Chappelle, as well as many other comedians and guest stars. Then, while shooting the third season, Chappelle abruptly left the show and pretty much disappeared from the public eye.

Well, that was fast! Just one week after David Letterman dropped the 'Late Show' bombshell that he would retire in 2015, his replacement has officially been announced. Following early and decisive rumors, Stephen Colbert will officially leave behind Comedy Central's 'Colbert Report' to ascend the late-night throne as the new host of CBS' 'The Late Show.' You're welcome, nation!

Last week, David Letterman announced that after more than 20 years, he'll be retiring as host of "The Late Show" on CBS. Now that he's a lame duck, he really appears to be embracing things and just saying f*** it!

Yesterday afternoon David Letterman shook up the late-night landscape once more with the announcement of his 2015 retirement from 'The Late Show with David Letterman,' however inevitable the exit might have been. The internet has been awash with gossip and replacement debates since, but has 'The Colbert Report' host Stephen Colbert emerged as CBS' clear frontrunner to take the 'Late Show' throne f