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Jay Leno, Oprah Winfrey. Kim Kardashian, Billy Crystal

NBC

It's hard to say goodbye, but a tweet will certainly suffice!

Last night, Jay Leno said his final farewell to The Tonight Show—complete with a hilarious last monologue. And although many famous friends stopped by to give the longtime host a proper sendoff, others took to Twitter to send him well wishes and reflect back on his 22 years on the air.  

A-listers such as Justin Timberlake, Britney Spears and Oprah took the time to bid adieu to the late-night legend, and some—ahem looking at you, Justin!—took the opportunity to ask Jay for a gift. Long-time friends President Barack Obama and the always-stylish first lady Michelle Obama also made sure to thank Leno for "all the memories and laughs."  

Scroll down to see all of the heartfelt messages and sweet memories from Martha Stewart, Kristin Chenoweth, Josh Groban, Kirstie Alley and many more!

Thanks for all the laughs, Jay, we're sure going to miss you!. Don't miss the final episode of Late Night With Jimmy Fallon this Friday, and tune in to see Fallon as he takes over The Tonight Show starting Feb. 17.

(NBC and E! Online are both part of the NBCUniversal family.)