On the Funny or Die skit “Will & Kate: Before Happily Ever After,” Girls star Allison Williams appears as Kate Middleton next to Prince William, played by Oliver Jackson Cohen, an actual London-born Brit. But while interviewing Williams this week, Jimmy Kimmel expressed his interest in playing the Prince, so the two gave it a shot. Cameras rolled on the faux reality show, in which Williams mustered her best British accent and Kate mannerisms — and Kimmel came across as the overzealous kid who just learned that they use different words in England and is trying to work every last one into a sentence.