Time to toss every physics nerd stereotype you ever had:
Brian May, the guitarist and founding member of the legendary rock band Queen, earned his PhD in astronomy last year from Imperial College London. His PhD thesis A Survey of Radial Velocities in the Zodiacal Dust Cloud has just been co-published by Springer and Canopus Publishing Ltd.
Since this is a political science blog, this opens the question of who is the biggest celebrity with a Ph.D. in political science. My vote is for Robert Vaughn. He was one of the Magnificent Seven, the Man from U.N.C.L.E., and he has a Ph.D. in Communications and Political Science.