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Inaugural guest Billy Crystal serenades Jay Leno with
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Inaugural guest Billy Crystal serenades Jay Leno with "Dear Mr. Leno" during the first "The Tonight Show with Jay Leno" at NBC Studios in Burbank, Calif., on May 26, 1992.(Credit: AP / Craig Fujii)

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'The Tonight Show with Jay Leno' notable moments and guests

Jay Leno has interviewed many top celebrities and politicians during his 20-plus years as the face of "The Tonight Show." From presidents to marriage proposals and more, take a look back at some of the most notable moments and guests before Leno takes a late-night bow on his final show Feb. 6.