The pair welcomed a son named Dakota Song Culkin, who died in 2008 at the age of 29, after the actor’s late sister, Dakota.
The child was born on April 5 in Los Angeles.
Culkin and Song met a few years ago on the set of “Changland”. They both had roles in the film.
Culkin is currently filming “American Horror Story” Season 10 with Sarah Paulson, Kathy Bates, Billy Lourd, Evan Peters, Lily Rabe and Finn Wittrock.