Actor-writer-producer-musician Charlie Day put his innate talents to use when he went from anonymity to stardom seemingly overnight as the star of one of cable television's most unexpectedly successful series. After early guest appearances on such popular TV mainstays as "Law & Order" (NBC, 1990-2010) and "Third Watch" (NBC, 1999-2005), Day eventually broke out as member of the ensemble cast on the boundary-pushing comedy "It's Always Sunny in Philadelphia" (FX, 2005- ). As one of four egocentric and morally challenged friends running an Irish pub in downtown Philly, Day and his equally funny co-stars - TV veteran Danny DeVito among them - gradually built up a fiercely loyal following with their politically incorrect antics, transforming the show into a verified sleeper hit. With his star on the rise, Day soon began transitioning into feature work with a supporting turn in the romantic comedy "Going the Distance" (2010), followed by a co-starring role in the black comedy "Horrible Bosses" (2011). A virtual unknown just five years earlier, Day suddenly found himself hosting "Saturday Night Live" (NBC, 1975- ) and working with such renowned filmmakers as Guillermo del Toro. With his boyish charm and blue-collar appeal, the multi-hyphenate Day carved out an impressive niche for himself on the entertainment landscape.