Warne was filling in for Hurley's husband and Indian textile heir Arun Nayar, who was not to be seen around.
Hurley, who has just entered into owning thoroughbred racehorses, may have been getting some betting tips off Warne a famed gambling fan.
"Glorious Goodwood tomorrow - just got some tips from my racing mad shepherd whilst trying on hats," The Courier Mail quoted Hurley as writing on Twitter.
Warne, who wore an expensively tailored pale grey suit, stayed with Hurley, who looked glamorous in pale pink chiffon and ruffled fascinator.
The unlikely couple have been friends for years and occasionally share friendly chats on the social network site Twitter.