Pres. Ronald Reagan arrived in Washington with phalanxes of famous friends in tow, Pres. Bill Clinton had a magnetic appeal to the Hollywood A-list, and Pres. John F. Kennedy was declared an honorary member of the "Rat Pack" by singing legend Frank Sinatra. Regardless of who walks the halls of power, they are bound to be visited, even befriended, by star power. It is part of a long-standing, tenuous love affair between the worlds of Hollywood and...