Horrible Bosses' Star Charlie Day, Wife Expecting A Baby

Charlie Day (L) and his wife Mary Elizabeth Ellis attend the premiere of 'Hotel Artemis' at the Regency Bruin Theatre in Los Angeles, California on May 19, 2018. Photo by Chris Chew/UPI

Photos and Pictures - Charlie Day of It's Always Sunny in Philadelphia and wife Mary Elizabeth Ellis are all smiles as they arrive at Hotel Solamar for the EW and SyFy celebration

LOS ANGELES, CA - JUNE 30, 2011: Charlie Day & wife Mary Elizabeth Ellis at the Los Angeles premiere of his new movie Horrible Bosses at Grauman's Chinese Theatre, Hollywood Stock Photo - Alamy

Charlie Day, Mary Elizabeth Ellis, Kaitlin Olson, Rob McElhenney, Glenn Howerton It's Always Sunny in Philadelphia & The League Season Premiere Hollywood. USA - 09.10.12 Where: Hollywood, CA When: 09 Oct 2012 Stock Photo - Alamy

Los Angeles Ca February 13 2017 Stock Photo 612485024

Always Sunny” Star And Wife Welcome Baby Boy

It's Always Sunny It's always sunny in philadelphia, Charlie and the waitress, It's always sunny

It's a boy for Mary Elizabeth Ellis and Charlie Day! And the name is. - Today's Parent

615 Mary Elizabeth And Charlie Day Stock Photos, High-Res Pictures, and Images - Getty Images

Horrible Bosses star Charlie Day to be a father: Wife Mary Elizabeth Ellis pregnant