<Li> Thomas Charles Day (father) </Li> <Li> Mary Day (mother) </Li> <P> Charles Peckham Day (born February 9, 1976) is an American actor, screenwriter, producer, comedian, and musician . He is best known for playing Charlie Kelly on It's Always Sunny in Philadelphia . On film, he is known for his role as Dale in the films Horrible Bosses (2011) and its 2014 sequel, as well as for his roles in Monsters University (2013), Pacific Rim (2013), The Lego Movie (2014), Fist Fight (2017), and Pacific Rim Uprising (2018). </P> <P> Day was born in New York City . His mother, Mary (née Peckham), was a piano teacher at The Pennfield School in Portsmouth, Rhode Island . His father, Dr. Thomas Charles Day, is a retired professor of music history at Salve Regina University in Newport, Rhode Island . His mother has English, Irish, and Welsh ancestry, while his father is of Irish and Italian descent . Day spent most of his childhood in Middletown, Rhode Island . </P>

Who plays charlie in it's always sunny