The 139th Kentucky Derby is this weekend! Horse fanatics, hat-wearing women, and spectators will gather at Churchill Downs for the legendary races. Celebrities like to get in on the fun too, with Zoe Saldana , Ian Somerhalder , Miranda Lambert, and then-newlyweds Jessica Simpson  and Nick Lachey  being just a few of the names that have traveled to the South for the big event in years past.
Click through to see all the wide-brimmed toppers, bright sundresses, and star couples as we celebrate the Kentucky Derby this weekend!
Mary J. Blige wore head-to-toe red for a party during the 2012 event.
Kim Kardashian  and her mom Kris Jenner brought big hats to the Derby in 2009.
Paula Patton followed the big hat trend in 2011.
Ashton Kutcher  was dressed to the nines for the 2012 event.
Diane Lane  led the Kentucky Derby Pegasus Parade in 2010 to promote Secretariat.
Kellan Lutz  hit the red carpet with his girlfriend, Sharni Vinson, in 2012.
Ashlee Simpson  posed in polka dots in 2010.
Nick Lachey  and Vanessa Minnillo  were off to the races in 2010.
Rachael Leigh Cook soaked up the sun at the 2001 races.
Marisa Miller  posed on her way into the Kentucky Derby in 2010.
Nicole Richie  wore yellow to attend the annual event in 2004.
Brooke Shields  brought her whole family to Kentucky for the 2009 Derby fun.
Gabrielle Union  and a pal matched in black and white in 2007.
Ian Somerhalder  wore a suit to Churchill Downs for the event in 2011.
Tom Brady  was on hand in 2008 to watch the horse races.
Lindsay Price  and Curtis Stone hung out at a Derby party in LA in 2011.
Adrian Grenier  was spotted in the 2008 crowd.
Before she became George Clooney 's girlfriend, Stacy Keibler checked out the 2006 Kentucky Derby.
Miranda Lambert brought her cowboy boots to the Derby in 2011.
Kate Walsh  got away from the races to promote Mott's in 2011.
Hugh Hefner brought his then-girlfriends to the 2008 derby.
Mario Lopez and a pregnant Courtney Mazza attended the 2010 races.
Usher  and Star Jones watched the event from a balcony in 2006.
Debra Messing  matched her hat to her silver dress at the Kentucky Derby in 2012.
Nick Lachey  and Jessica Simpson  attended the 2001 Kentucky Derby together.
Niki Taylor and her husband Burney Lamar locked lips on the red carpet at the Kentucky Derby in 2011.
The queen visited Churchill Downs for the 133rd Kentucky Derby in 2007.
In 2004, Eli Manning and Carson Daly suited up to watch the races.
Sofia Coppola and Spike Jones checked out the track in 2001.
Zoe Saldana  got close to the track in 2007.
Maria Menounos brought a bright look to the 2010 festivities.
In 2006, Jaime Pressly popped up in Kentucky for the races.
Melissa Joan Hart and Jerry O'Connell  grabbed drinks inside in 2001.
Diddy  smoked a cigar during the 2001 races.
Paris Hilton  and Doug Reinhardt celebrated the 2009 Derby at the Barnstable Brown Party.
LeAnn Rimes smiled bright in a blooming dress at the 135 Kentucky Derby in 2009.
Molly Sims dressed up in 2008.
Ginnifer Goodwin  looked sleek and sophisticated in a bright dress and matching hat for the 2012 festivities.
Heidi Montag  and Spencer Pratt  cozied up at Churchill Downs in 2008.
Jessica Simpson  and Nick Lachey  got in on the fun in 2004.
Joey Fatone accessorized his dapper look with a straw hat in 2012.
Melissa Joan Hart got floral for the 2007 races.
Rebecca Romijn  and Jerry O'Connell  were in the crowd in 2010.
Kid Rock  signed autographs on his way into the 2009 event.
Ashanti brought her best floral look in 2006.
Miranda Lambert kept her bets a secret while checking out the races in 2012.