Mary Elizabeth Ellis - wikipedia Mary Elizabeth Ellis Mary Elizabeth Ellis Ellis at the 2010 San Diego Comic - Con International ( 1979 - 05 - 11 ) May 11, 1979 ( age 38 ) Laurel, Mississippi, U.S. Alma mater Southern Methodist University Occupation Actress Spouse ( s ) Charlie Day ( m. 2006 ) Children Mary Elizabeth Ellis ( born May 11, 1979 ) is an American actress. She is best known for her role as The Waitress on the FX sitcom It 's Always Sunny in Philadelphia. She has also starred in the NBC sitcom Perfect Couples and the Fox sitcom The Grinder. She also starred as Nick 's ex-girlfriend in the series New Girl. Contents 1 Early life 2 Career 3 Personal life 4 Filmography 4.1 Film 4.2 Television 5 Stage 6 References 7 External links Early life Ellis was born in Laurel, Mississippi. She graduated from Southern Methodist University in 2002. Career Ellis has appeared in a number of television series, including The Grinder, Cold Case, Without a Trace, House, Happy Endings, New Girl, Reno 911 !, and the Netflix original series `` Santa Clarita Diet ''. She is best known for her role as The Waitress on the FX comedy series It 's Always Sunny in Philadelphia. In 2008, she co-wrote and starred in the independent film A Quiet Little Marriage. Ellis and Artemis Pebdani wrote and starred together in the stage show Mother May I Dance with Mary Jane 's Fist ? : A Lifetime Original Play at the Upright Citizens Brigade Theater in Los Angeles, California. In addition, Ellis and Pebdani are members of the Los Angeles - based performance group Discount Cruise to Hell. Ellis was a series regular on the NBC romantic comedy series Perfect Couples, which ran for one season in 2011. Ellis also stars in The Lonely Island 's music video for the song `` Diaper Money ''. In 2015 Ellis got her first main role as Debbie Sanderson, across Fred Savage and Rob Lowe in The Grinder ( TV series ). Personal life Ellis married her It 's Always Sunny in Philadelphia co-star Charlie Day on March 4, 2006. Their first child, a son named Russell Wallace Day, was born on December 15, 2011. Filmography Film Year Title Role Notes 2008 A Quiet Little Marriage Olive Co-writer 2009 Pulling Karen 2014 The Last Time You Had Fun Alison 2015 The Truth About Lies Sharon 2015 The Last Time You Had Fun Allison 2016 Free State of Jones Margaret 2016 Masterminds Michelle Chambers Television Year Title Role Notes Cracking Up Jennifer Episode : `` Panic House '' Reno 911 ! Inbred Twin Episode : `` Not Without My Mustache '' 2005 -- present It 's Always Sunny in Philadelphia The Waitress 26 episodes 2006 House Sophie Episode : `` Que Será Será '' 2007 Without a Trace Sally Price Episode : `` Skin Deep '' 2009 Old Friends Portia Bridges Episode : `` Introductions '' 2009 Cold Case Shelly Reid Episode : `` Lotto Fever '' 2011 Perfect Couples Amy 11 episodes 2011 -- 2014 New Girl Caroline 6 episodes 2012 Georgia Georgia 3 episodes 2012 Up All Night Connie Chafin 2 episodes 2012 -- 2013 Happy Endings Daphne Wilson 2 episodes 2013 The Millers Debbie Unaired pilot 2013 Brooklyn Nine - Nine Dr. Rossi Episode : `` M.E. Time '' 2014 -- 2016 Comedy Bang ! Bang ! Network Executive / Cordy 2 episodes 2015 Drunk History Dorothy Fuldheim Episode : `` Cleveland '' 2015 -- 2016 The Grinder Debbie Sanderson Main role 2017 Santa Clarita Diet Lisa Palmer Stage Year Title Role Venue The Tempest Ariel PCPA Theaterfest 2002 Killer Joe Dotty Artists Repertory Theatre Portland 2015 Trevor Ashley Circle X Theatre Co. References Jump up ^ `` 2001 - 2002 Class Notes ''. SMU Magazine 2013. 2013. Retrieved 1 January 2016. Jump up ^ Conversations with Ross : Featuring Mary Elizabeth Ellis Jump up ^ `` NBC TV show ratings '' ( Press release ). NBC Universal. Jan 27, 2011. Retrieved May 12, 2010. Jump up ^ ( 1 ) Archived May 21, 2011, at the Wayback Machine. Jump up ^ `` Television News, Reviews and TV Show Recaps -- HuffPost TV ''. Tvsquad.com. Retrieved 2013 - 12 - 31. Jump up ^ Wedemeyer, Jessica ( 2011 - 07 - 23 ). `` Charlie Day, Mary Elizabeth Ellis Expecting a Baby ''. People.com. Retrieved 2013 - 12 - 31. Jump up ^ Actors Charlie Day & Mary Elizabeth Ellis Welcome A Baby Boy Jump up ^ http://www.imdb.com/title/tt0472954/fullcredits?ref_=tt_cl_sm#cast External links Wikimedia Commons has media related to Mary Elizabeth Ellis. Mary Elizabeth Ellis on IMDb Mary Elizabeth Ellis at AllMovie `` The Days of Disco '' interview with Mary Elizabeth Ellis and Charlie Day on MonsterFresh.com VIAF : 168947981 LCCN : no2011048629 SNAC : w69w2fhf Retrieved from `` https://en.wikipedia.org/w/index.php?title=Mary_Elizabeth_Ellis&oldid=794774681 '' Categories : 1979 births Living people 21st - century American actresses Actresses from Mississippi American film actresses American stage actresses American television actresses American women comedians People from Laurel, Mississippi Southern Methodist University alumni Hidden categories : Webarchive template wayback links All articles with dead external links Articles with dead external links from June 2017 Articles with permanently dead external links Articles with hCards Wikipedia articles with VIAF identifiers Wikipedia articles with LCCN identifiers Wikipedia articles with SNAC - ID identifiers Talk Contents About Wikipedia Asturianu تۆرکجه Deutsch Español فارسی Français 한국어 Português Русский Türkçe Edit links This page was last edited on 10 August 2017, at 00 : 00. 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Question: who plays the waitress on it's always sunny
Answer: Mary Elizabeth Ellis