From Wikipedia: http://en.wikipedia.org/wiki/Janeane_Garofalo
Garofalo married Robert Cohen, at the time a writer for The Ben Stiller Show, in Las Vegas in 1991. She later explained it was intended to be a joke, not thinking it was legal unless filed at a local courthouse. It was revealed later, when Cohen tried to get married for real, that the marriage was indeed legal. The marriage was dissolved in 2012.