By the late 60s/early 70s, racing had become very "chic" here in the States and several movie stars were actively involved, including James Garner, Steve McQueen and Dick Smothers. Here are some photos of them from that era:

James Garner at Daytona 1969. After "Grand Prix", Garner became very interested in racing but never drove himself, to my knowledge. He entered a pair of Lola T-70 coupes under the American International Racing team banner. They had some of the prettiest pit "groupies" I had ever seen to that point and each had their nickname ("Bunny", etc) embroidered on the upper back of their racing jackets. Class act!

Steve McQueen braking for the Hairpin, Sebring 1970. Of course, this is the race he and Peter Revson almost won outright, losing by 23 seconds to the one and only Mario. Most people who drove against McQueen say that he could have been right up there with the best if he had devoted himself to racing. Interestingly, this wasn't his first Sebring - he drove a Sprite in 1962.

Dick Smothers in Victory Lane, Sebring 1971. He co-drove a Corvette with John Greenwood to 7th overall, 1st in GT class. Dick went on to be quite competitive in Formula A racing here in the states.
I hope this thread isn't too silly, but I do think it is an interesting footnote to racing. What other examples do any of you have out there?