By Leah Ornstein
Radar Style & Beauty Editor

Still dreaming about wacky hats after the Royal Wedding?

The Kentucky Derby starts on Friday, so be prepared for yet another round of fabulous fascinators!  RadarOnline.com has photos of Hollywood’s maddest hatters at the famous races over the years, in this special photo feature.

PHOTOS: Kentucky Derby Dolls!

From Hugh’s hottest Girls Next Door to then-Newlyweds Jessica Simpson and Nick Lachey, you never know who you are going to find horsing around at the Derby!

PHOTOS: Hats Off To The Royal Wedding!

• TAGS

• Style
• Adrian Grenier
• Anna Nicole Smith
• Ashlee Simpson
• Bethenny Frankel
• Bridget Marquardt
• Brooke Shields
• Courtney Laine Mazza
• Dorys Erving
• Holly Madison
• Hugh Hefner
• Isabel Lucas
• Jaime Pressly
• Jerry O’Connell
• Jessica Simpson
• Julius Erving
• Kendra Wilkinson
• Kentucky Derby
• LeAnn Rimes
• Mario Lopez
• news
• Nick Lachey
• Pete Wentz
• Rebecca Romijn
• Star Jones
• style
• Usher

PHOTOS: Kentucky Derby Dolls!

• TAGS

• Adrian Grenier
• Anna Nicole Smith
• Ashlee Simpson
• Bethenny Frankel
• Bridget Marquardt
• Brooke Shields
• Courtney Laine Mazza
• Dorys Erving
• Holly Madison
• Hugh Hefner
• Isabel Lucas
• Jaime Pressly
• Jerry O’Connell
• Jessica Simpson
• Julius Erving
• Kendra Wilkinson
• Kentucky Derby
• LeAnn Rimes
• Mario Lopez
• news
• Nick Lachey
• Pete Wentz
• Rebecca Romijn
• Star Jones
• style
• Usher