Josh Byrne (born February 15, 1984) is an American actor best known for his role as Brendan Lambert on the ABC family sitcom Step by Step, from 1991 to 1997. His disappearance from the show was never explained during the show's final season, which aired on CBS in 1997-1998.

Byrne's other television credits include Who's The Boss? and The Family Man. In the 1992 feature film Mr. Saturday Night, he portrayed the younger version of Billy Crystal's character with his then-future Step By Step co-star Jason Marsden who also played Crystal's character as a teenager.

[ Source: Wikipedia ]