Celebrities' Kentucky Derby hats through the years

Actor Blair Underwood attends Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky.

Kid Rock attends Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky.

Victoria Justice attends Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky.

Chef Graham Elliot attends Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky.

Chef Tom Colicchio attends Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky.

Alicia Etheredge and Bobby Brown attend Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky.

Actress Aisha Tyler attends Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky.

American figure skaters Tara Lipinski and Johnny Weir attend Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky.

Professional boxer Laila Ali attends Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky. (Photo by Dia Dipasupil/Getty Images for Chruchill Downs)

Actor Anthony Anderson attends Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky.

Actor Jesse Spencer attend Kentucky Derby 144 on May 5, 2018 in Louisville, Kentucky.

Jill Goodacre

Jill Goodacre and Harry Connick Jr. attend the 143rd Kentucky Derby at Churchill Downs on May 6, 2017 in Louisville, Kentucky.

Dannielynn Birkhead

Dannielynn Birkhead and Larry Birkhead attend the 143rd Kentucky Derby at Churchill Downs on May 6, 2017 in Louisville, Kentucky.

Courtney Sixx

Courtney Sixx attends the 143rd Kentucky Derby at Churchill Downs on May 6, 2017, in Louisville, Kentucky.

Susan Geston

Susan Geston and Jeff Bridges attend the 143rd Kentucky Derby at Churchill Downs on May 6, 2017, in Louisville, Kentucky.

Mira Sorvino

Mira Sorvino attends the 143rd Kentucky Derby at Churchill Downs on May 6, 2017, in Louisville, Kentucky.

Katie Couric

Katie Couric attends the 143rd Kentucky Derby at Churchill Downs on May 6, 2017, in Louisville, Kentucky.

Robin Meade

Robin Meade attends the 143rd Kentucky Derby at Churchill Downs on May 6, 2017, in Louisville, Kentucky.

Laura Bell Bundy

Laura Bell Bundy attends the 143rd Kentucky Derby at Churchill Downs on May 6, 2017 in Louisville, Kentucky.

Giada De Laurentiis

Giada De Laurentiis attends the 143rd Kentucky Derby at Churchill Downs on May 6, 2017, in Louisville, Kentucky.

Mary Wilson

Richie Sambora and Mary Wilson attend the 143rd Kentucky Derby at Churchill Downs on May 6, 2017, in Louisville, Kentucky.

Star Jones

TV personality Star Jones attends the 142nd Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 07, 2016.

The Supremes' Mary Wilson

Mary Wilson of The Supremes attends the 142nd Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 07, 2016.

Brittany Howard

Musician Brittany Howard of the Alabama Shakes attends the Delta Dental Celebrity Green Room during the 142nd Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2016.

Gayle King

Gayle King attends the Delta Dental Celebrity Green Room during the 142nd Kentucky Derby at Churchill Downs in Louisville, Kentucky on May 7, 2016.

Kate Upton

Kate Upton smiles in the paddock before the 142nd running of the Kentucky Derby horse race at Churchill Downs in Louisville, Kentucky, on Saturday, May 7, 2016.

Hillary Scott

Singer Hillary Scott of Lady Antebellum attends the 142nd Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 07, 2016.

Vanessa Lachey

Vanessa Lachey attends the 141st running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 2, 2015.

Ne-Yo and Crystal Renay

Crystal Renay and Ne-Yo attend the 141st running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 2, 2015.

Kendra Wilkinson-Baskett

Kendra Wilkinson-Baskett attends the 141st running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 2, 2015.

Andi Dorfman

Television personality Andi Dorfman attends the 141st running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 2, 2015.

Luke Bryan and Caroline Boyer

Singer Luke Bryan and wife Caroline Boyer celebrate the 139th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 4, 2013.

Coco Rocha

Coco Rocha attends the 139th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 4, 2013.

Jane Seymour

Actress Jane Seymour attends the 139th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 4, 2013.

Miranda Lambert

Singer Miranda Lambert attends the 139th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 4, 2013.

Kellan Lutz and Sharni Vinson

Kellan Lutz and Sharni Vinson pose with a limited edition 6 liter Moet & Chandon Imperial bottle for the brand's philanthropic initiative "Sign for the Roses" on the red carpet at the 138th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 5, 2012.

Star Jones

Star Jones signs a limited edition 6 liter Moet & Chandon Imperial bottle for the brand's philanthropic initiative "Sign for the Roses" on the red carpet at the 138th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 5, 2012.

Ginnifer Goodwin

Actress Ginnifer Goodwin attends the 138th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 5, 2012.

Kate Flannery

Actress Kate Flannery attends the 138th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 5, 2012.

Mary J. Blige

Mary J. Blige signs a limited edition 6 liter Moet & Chandon Imperial bottle for the brand's philanthropic initiative "Sign for the Roses" on the red carpet at the 138th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 5, 2012.

Miranda Lambert

Miranda Lambert signs a limited edition 6 liter Moet & Chandon Imperial bottle for the brand's philanthropic initiative "Sign for the Roses" on the red carpet at the 138th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 5, 2012.

Cyndi Lauper

Cyndi Lauper with a limited edition 6 liter Moet & Chandon Imperial bottle for the brand's philanthropic initiative "Sign for the Roses" on the red carpet at the 138th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 5, 2012.

Joey Fatone and Shawn Stockman

Joey Fatone and Shawn Stockman sign a limited edition 6 liter Moet & Chandon Imperial bottle for the brand's philanthropic initiative "Sign for the Roses" on the red carpet at the 138th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 5, 2012.

Ice-T and Nicole 'Coco' Austin

Ice-T and Nicole "Coco" Austin pose with a limited edition 6 liter Moet & Chandon Imperial bottle for the brand's philanthropic initiative "Sign for the Roses" on the red carpet at the 138th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 5, 2012.

Vicki Gunvalson

"Real Housewives of Orange County" reality star Vicki Gunvalson attends the 137th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2011.

Rozonda 'Chilli' Thomas

Singer/TV personality Rozonda "Chilli" Thomas attends the 137th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2011.

Kate Gosselin

TV personality Kate Gosselin attends the 137th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2011.

Vanessa Lachey

Vanessa Lachey attends the 137th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2011.

Jordin Sparks

Singer Jordin Sparks attends the 137th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2011.

Aubrey O'Day

Singer/TV personality Aubrey O'Day attends the 137th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2011.

Kate Walsh

Actress Kate Walsh visits the Mott's Garden Blend VIP suite at the 137th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2011.

Kim Kardashian arrives at the 135th at Churchill Downs in Louisville, Kentucky, on May 2, 2009.

Actress Molly Sims attends the 134th at Churchill Downs in Louisville, Kentucky, on May 3, 2008.

Heidi Montag of MTV's "The Hills" attends the 134th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 3, 2008.

Reality television personality Victoria Gotti arrives at the 131st running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2005.

Actress Tori Spelling arrives at the 131st running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2005.

Singer Josh Groban and January Jones arrive at the 131st running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2005.

Actress Jamie-Lynn Sigler arrives at the 131st running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 7, 2005 in Louisville, Kentucky.

Jermaine Dupri attends the 130th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 1, 2004.

Wayna Morris, Shawn Stockman and Nathan Morris of Boyz II Men attend the 130th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 1, 2004.

Television personality Carson Daly attends the 130th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 1, 2004.

LaToya Jackson attends the 130th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 1, 2004.

Kelly Rowland of Destiny's Child attends the 130th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 1, 2004.

Jessica Simpson and Nick Lachey attend the 130th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 1, 2004.

Actress Kim Cattrall attends the 130th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 1, 2004.

Socialite Nicole Richie attends the 130th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 1, 2004.

Actress and model Anna Nicole Smith attends the 130th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 1, 2004.

George Strait and Kid Rock during the 129th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 3, 2003.

Actress Susan Lucci is interviewed by the local media as she arrives at the 129th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 3, 2003.

Singer Janet Jackson and her family and friends attend the 129th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 3, 2003.

Singer Jessica Simpson sings "My Old Kentucky Home" before the 128th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, on May 4, 2002.

Singer Meat Loaf and his fiancee, Deborah Gillespie, pose before the 128th running of the run for the roses Kentucky Derby At Churchill Downs in Louisville, Kentucky, on May 4, 2002.