Photos: Best Impressions on Saturday Night Live

Dan Aykroyd as Julia Child in 1978.Edie Baskin—Warner Bros./Archive Photos/Getty Images

Dan Aykroyd as President Richard Nixon in 1978.Fred Hermansky—NBC/Getty Images

Dana Carvey as Ross Perot in 1993.Raymond Bonar—NBC/Getty Images

Norm MacDonald as David Letterman in 1997.Mary Ellen Matthews—NBC/Getty Images

From left: Molly Shannon as Monica Lewinsky and John Goodman as Linda Tripp in 1998.Mary Ellen Matthews—NBC/Getty Images

From left: Jimmy Fallon as Michael Stipe and Ana Gasteyer as Celine Dion in 1998.Mary Ellen Matthews—NBC/Getty Images

Darrell Hammond as Sean Connery in 2000.Dana Edelson—NBC/Getty Images

Will Ferrell as Alex Trebek in 2002.Mary Ellen Matthews—NBC/Getty Images

Maya Rudolph as Donatella VersaceMary Ellen Matthews—NBC/Getty Images

Alec Baldwin as Tony Bennett in 2005.Dana Edelson—NBC/Getty Images

From left: Darrell Hammond as Bill Clinton and Will Ferrell as Janet Reno in 2007.NBC/Getty Images

Will Farrell as President George W. Bush in 2008.Dana Edelson—NBC/Getty Images

From left: Tina Fey as Governor Sarah Palin and Amy Poehler as Senator Hillary Clinton in 2008.Dana Edelson—NBC/Getty Images

Kristen Wiig as Liza Minnelli in 2012.Dana Edelson—NBC/Getty Images

Kenan Thompson as Rev. Al Sharpton on Oct. 25, 2014.Dana Edelson—NBC/Getty Images

Kevin Hart as James Brown on Jan. 17, 2015.Dana Edelson—NBC/Getty Images

Kate McKinnon as Justin Bieber on Jan. 17, 2015.Dana Edelson—NBC/Getty Images

See the Best Impressions on Saturday Night Live