20 Mind-Blowing Facts About It's Always Sunny In Philadelphia

3. So Are Charlie And The Waitress

McElhenney and Olson are not the only stars from the show who are married to each other. In a recurring theme, another conflicted on-screen pairing are also man and wife when the cameras are not rolling. Charlie Day and Mary Elizabeth Ellis are also happily married with kids in real life despite their tetchy on-screen relationship. Day plays Charlie Kelly, an excitable man child who does not possess great social skills. Ellis plays 'The Waitress', the woman who Charlie loves but who wants nothing to do with him. The two have been dating since 2004 when they played incestuous twins on an episode of Reno 911. How lovely.