Photos: Star sightings
Longines Kentucky Derby
COMMERCIAL IMAGE - In this photograph taken by AP Images for Longines, tennis legend Stefanie Graf, a Longines Ambassador, walks the red carpet at the Derby Eve Barnstable Brown Party, Friday, May 4, 2012, in Louisville, Ky., which raises money for diabetes and Longines was an official sponsor. Longines, the Swiss watch manufacturer known for its luxury timepieces, is the Official Watch and Timekeeper of the 138th annual Kentucky Derby. (Diane Bondareff/AP Images for Longines)