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1 of 17Dan Aykroyd as Julia Child in 1978.Edie Baskin—Warner Bros./Archive Photos/Getty Images -
2 of 17Dan Aykroyd as President Richard Nixon in 1978.Fred Hermansky—NBC/Getty Images -
3 of 17Dana Carvey as Ross Perot in 1993.Raymond Bonar—NBC/Getty Images -
4 of 17Norm MacDonald as David Letterman in 1997.Mary Ellen Matthews—NBC/Getty Images -
5 of 17From left: Molly Shannon as Monica Lewinsky and John Goodman as Linda Tripp in 1998.Mary Ellen Matthews—NBC/Getty Images -
6 of 17From left: Jimmy Fallon as Michael Stipe and Ana Gasteyer as Celine Dion in 1998.Mary Ellen Matthews—NBC/Getty Images -
7 of 17Darrell Hammond as Sean Connery in 2000.Dana Edelson—NBC/Getty Images -
8 of 17Will Ferrell as Alex Trebek in 2002.Mary Ellen Matthews—NBC/Getty Images -
9 of 17Maya Rudolph as Donatella VersaceMary Ellen Matthews—NBC/Getty Images -
10 of 17Alec Baldwin as Tony Bennett in 2005.Dana Edelson—NBC/Getty Images -
11 of 17From left: Darrell Hammond as Bill Clinton and Will Ferrell as Janet Reno in 2007.NBC/Getty Images -
12 of 17Will Farrell as President George W. Bush in 2008.Dana Edelson—NBC/Getty Images -
13 of 17From left: Tina Fey as Governor Sarah Palin and Amy Poehler as Senator Hillary Clinton in 2008.Dana Edelson—NBC/Getty Images -
14 of 17Kristen Wiig as Liza Minnelli in 2012.Dana Edelson—NBC/Getty Images -
15 of 17Kenan Thompson as Rev. Al Sharpton on Oct. 25, 2014.Dana Edelson—NBC/Getty Images -
16 of 17Kevin Hart as James Brown on Jan. 17, 2015.Dana Edelson—NBC/Getty Images -
17 of 17Kate McKinnon as Justin Bieber on Jan. 17, 2015.Dana Edelson—NBC/Getty Images
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