Gen Pershing, 1924 Packard 
Groucho Marx and his 1930 Packard 
Clark Gable and his 1935 Duesenburg 
Above, the Little Rascals 
Al Jolson and his custom 1928 Mercedes Spl 
Buster Keaton and his 1928 Austin 
WC Fields with a 1930 Bantam movie car, in the movie 300 Yard Drive 
Rudy Valentino's (unbelievable biography: http://emol.org/emclub/?q=rudolphvalentino )cars above an Voisin, and below a 1925 Isotta Frashini. His 1923 Voisin can be seen in the Nethercutt Museum: http://justacarguy.blogspot.com/2011/03/rudy-valentinos-voisin-hood-ornament-by.html 
A 1910 Stanley Steamer and in the back is a 1940 Packard Darin 
John Wayne and Maureen O'Hara in a 1914 Stutz Bearcat 
a 1911 Ford and Jimmy Durante... what a pit crew! If you enjoyed this post, try this following link where I've posted many similar Hollywood stars and their vehicles like Rita Hayworth pulling the bumpers off her car for the scrap metal effort for WW2, John Wayne on a motorbike, Hitchcock in his 300SL, and dozens more: http://justacarguy.blogspot.com/search/label/celebrity