"Porfirio Rubirosa (in polo shirt) and Zsa Zsa Gabor at Santa Barbara  (I was lurking somewhere near)."

(7-20-09)  From historian Ron Cummings:

"Might be Bill Stroppe, Kurtis 500S driver, in the Lincoln tee-shirt.

(7-20-09)  From Chuck Fawcett:

"Of course, that's Bill Stroppe next to Zsa Zsa.  Taken at Santa Barbara, but not by me.  Photographer unknown."

(10-21-09)   From author and historian Michael T. Lynch:

"Celebrity couple from the 50s consists of  Porfirio Rubirosa and Zsa Zsa Gabor.  Ruby raced a 500 Mondial that weekend, which he sold to John von Neumann on the spot.  Von Neumann's first Ferrari."