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Get your mint juleps ready, folks, because it's Derby day. Saturday marks the 139th running of the Kentucky Derby at Churchill Downs. And as most everyone knows, it's not all about the ponies. Endearingly over-the-top hats are also a major part of the festivities. Here, a photographic guide to some of our favorites from years past:

May 6, 2006 (Jamie Squire/Getty Images)

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May 3, 2003 (Jamie Squire/Getty Images)

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May 3, 2008 (Jamie Squire/Getty Images

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May 2, 2009 (REUTERS/Brent Smith)

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May 2, 2009 (REUTERS/Jeff Haynes)

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May 7, 2011 (Frank Jansky/ZUMA Press/Corbis)

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May 4, 1986 (Kit Houghton/CORBIS)

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May 7, 2011 (Rob Carr/Getty Images)

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May 5, 2012 (Elsa/Getty Images)

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May 2, 2009 (REUTERS/Jeff Haynes/Corbis)

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May 7, 2011 (Al Bello/Getty Images)

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May 5, 2012 (Jamey Price/Getty Images)