Kieran Kyle Culkin (born September 30, 1982) is an American actor and the younger brother of Macaulay Culkin.
Culkin was born in New York City, the son of Patricia Brentrup and Kit Culkin, a former stage actor with a long career on Broadway.
He has four brothers, Shane (born 1976), Macaulay (born 1980), Christian (born 1987), and Rory (born 1989), and two sisters, Dakota (1979–2008) and Quinn (born 1984).
Culkin's first film role was a small part alongside his brother, Macaulay, in Home Alone as cousin Fuller McCallister. He continued acting as a child and teenager, mainly working in comedies, including Home Alone 2: Lost in New York and Father of the Bride and its sequel. He also played a role in She's All That as Laney's younger brother, Simon.
As a teenager, he alternated between lead roles in independent films and small parts in mainstream films. He played the title role in the film Igby Goes Down, for which he was nominated for a Golden Globe Award; and previously appeared in the Academy Award-nominated movie Music of the Heart. He also had two lead role in The Mighty as Kevin Dillon.
He played Buff in Eric Bogosian's updated version of SubUrbia at the Second Stage Theatre in New York; and in 2010, Culkin played Scott Pilgrim's 'cool gay roommate' Wallace Wells in the movie Scott Pilgrim vs. the World.