Heath Ledger's dad Kim gave his son's performance in The Dark Knight the thumbs up as he left the world premiere of the movie on Monday.

Ledger's family flew to New York to attend the screening of the tragic actor's final completed film.

And as the late actor's father left the premiere he was asked how it felt to attend, to which he responded with a thumbs up.

He added that it was "very good", reports People.com.

Ledger died from an accidental drug overdose in January.