John Velazquez and Animal Kingdom

Animal Kingdom, who was 20-1 on the morning line, won the Kentucky Derby on Saturday.

Shackleford kept a commanding lead throughout the race, but Animal Kingdom, ridden by John Velazquez and trained by H. Motion, overtook his competitors on the homestretch to win the 137th Kentucky Derby. Velazquez, who was initially set to ride Uncle Mo before the horse was scratched, replaced jockey Robby Albarado after an injury. Shackleford only placed fourth.

Super Saver winner of Kentucky Derby 2010

The Derby is the first leg in the race for the Triple Crown, followed by the Preakness Stakes and Belmont Stakes.

Churchill Downs had a record attendance of 164,858 people. Among the celebrities in attendance this year: Nick Lachey and fiancé Vanessa Minnillo, Big Love's Bill Paxton, Law & Order: SVU's Chris Meloni, Kate Gosselin (plus eight!), O.C. housewife Vicki Gunvalson, Olympic champ Lindsey Vonn, Private Practice's Kate Walsh, Maria Menounos, Erin Andrews and American Idol's Jordin Sparks.