PHOTOS: Horses and hats at the 2015 Kentucky Derby

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Saturday, May 2, 2015
Victor Espinoza rides American Pharoah to victory in the 141st running of the Kentucky Derby on Saturday, May 2, 2015, in Louisville, Ky.
Victor Espinoza rides American Pharoah to victory in the 141st running of the Kentucky Derby on Saturday, May 2, 2015, in Louisville, Ky.
Victor Espinoza rides American Pharoah to victory in the 141st running of the Kentucky Derby on Saturday, May 2, 2015, in Louisville, Ky.
Victor Espinoza rides American Pharoah to victory in the 141st running of the Kentucky Derby on Saturday, May 2, 2015, in Louisville, Ky.
Victor Espinoza rides American Pharoah to victory in the 141st running of the Kentucky Derby on Saturday, May 2, 2015, in Louisville, Ky.
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
The scene at the Kentucky Derby on Saturday, May 2nd, 2015
A horse gets a bath after a morning workout at Churchill Downs on May 1, 2015, in Louisville, Ky.
A woman wears a hat before the 141st running of the Kentucky Derby horse race at Churchill Downs on May 2, 2015, in Louisville, Ky.
Ginny Keen wears a hat before the 141st running of the Kentucky Derby horse race at Churchill Downs on May 2, 2015, in Louisville, Ky.
Michael Parrett, left, and Dustin Doerflinger look over their bets before the 141st running of the Kentucky Derby horse race at Churchill Downs on May 2, 2015, in Louisville, Ky.
Lovely Maria, ridden by Kerwin Clark, wins the Longines Kentucky Oaks on May 1, 2015, in Louisville, Ky.
Exercise rider Patti Krotenko gallops Kentucky Derby entrant Carpe Diem at Churchill Downs in Louisville, Ky. on May 1, 2015.
A woman wears a hat during a morning workout for the 141th running of the Kentucky Derby horse race at Churchill Downs on May 1, 2015, in Louisville, Ky.
Horses are seen in their stalls after a morning workout at Churchill Downs on May 1, 2015, in Louisville, Ky.
A horse is walked after a morning workout at Churchill Downs on May 1, 2015, in Louisville, Ky.
Kentucky Derby favorite American Pharoah, ridden by exercise rider Jorge Alvarez, gallops at Churchill Downs in Louisville, Ky. on April 30, 2015.
Exercise rider Vicki King takes Kentucky Derby entrant Upstart for a morning workout for the 141th running of the Kentucky Derby horse race at Churchill Downs on May 1, 2015.
A horse is taken out for a morning workout at Churchill Downs on May 1, 2015, in Louisville, Ky.
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PHOTOS: Horses and hats at the 2015 Kentucky DerbyVictor Espinoza rides American Pharoah to victory in the 141st running of the Kentucky Derby on Saturday, May 2, 2015, in Louisville, Ky.
AP Photo/Morry Gash

LOUISVILLE, Ky. -- The 141st Kentucky Derby returns to Churchill Downs on Saturday. Check out all the celebrities, wild hats, and of course the horses at what is known as "the most exciting two minutes in sports."