Culkin and Song have been together for four years and are the parents of 9-month-old Dakota Song Culkin, E! News reported.
Their son was born in April and was named after Culkin’s late sister, People magazine reported.
Song, 33, was seen wearing a ring on her left hand as recently as Tuesday while walking around Beverly Hills, US Weekly reported.
This will be the first marriage for Song, People magazine reported.
Culkin, 41, was married to Rachel Miner from 1998 to 2002.
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Through the years Paris, France - 11 December 1990, American actor Macaulay Culkin in his hotel room in Paris with his mother, Patricia, right, and his father, Kit, left., (Photo by Francis Apesteguy/Getty Images) (Francis Apesteguy/Getty Images)
Through the years Actor Macaulay Culkin arrives at the 1991 Golden Globe Awards. This photo appears on page 104 in Frank Trapper's RED CARPET book. (Photo by Frank Trapper/Corbis via Getty Images) (Frank Trapper/Corbis via Getty Images)
Through the years Macaulay Culkin during Nickelodeon and Macaulay Culkin on the set of Richie Rich in Los Angeles, CA, United States. (Photo by Jeff Kravitz/FilmMagic, Inc) (Jeff Kravitz/FilmMagic, Inc)
Through the years Actor and author Macaulay Culkin poses for photographs before reading and signing copies of his new book "Junior" at Barnes & Noble on March 13, 2006 in New York City. (Photo by Mat Szwajkos/Getty Images) (Mat Szwajkos/Getty Images)
Through the years Actor Macaulay Culkin attends a signing for his new book "Junior" at Barnes & Noble Booksellers at The Grove on March 18, 2006 in Los Angeles, California. (Photo by David Livingston/Getty Images) (David Livingston/Getty Images)
Through the years In this handout photo provided by Harrison Funk/The Jackson Family, Actor Macaulay Culkin and Actress Mila Kunis attend Michael Jackson's funeral service held at Glendale Forest Lawn Memorial Park on September 3, 2009 in Glendale, California. Jackson, 50, the king of pop, died at UCLA Medical Center after going into cardiac arrest at his rented home on June 25, 2009 in Los Angeles, California. (Photo by Harrison Funk/The Jackson Family via Getty Images) (Handout/Getty Images)
Through the years Actor Macaulay Culkin arrives backstage at the 82nd Annual Academy Awards held at Kodak Theatre on March 7, 2010 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images) (Kevork Djansezian/Getty Images)
Through the years Macaulay Culkin attends the 2018 American Music Awards at Microsoft Theater on October 9, 2018 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images) (Frazer Harrison/Getty Images)
Through the years Macaulay Culkin speaks onstage at the "Robot Chicken" season 10 premiere presented by Adult Swim at The Theatre at Ace Hotel on September 27, 2019 in Los Angeles, California. (Photo by Erik Voake/Getty Images for Adult Swim) (Erik Voake/Getty Images for Adult Swim)
Through the years Macaulay Culkin walks the runway during Gucci Love Parade on November 02, 2021 in Los Angeles, California. (Photo by Emma McIntyre/Getty Images for Gucci) (Emma McIntyre/Getty Images for Gucci)
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Through the years LOS ANGELES, CA - OCTOBER 27: Actress Brenda Song arrives at the premiere of Sony Pictures' "This Is It" held at Nokia Theatre Downtown LA on October 27, 2009 in Los Angeles, California. (Photo by Jason Merritt/Getty Images) (Jason Merritt/Getty Images)
Through the years Actress Brenda Song attends the 17th Annual EIF Revlon Run/Walk For Women on May 8, 2010 in Los Angeles, California. (Photo by Valerie Macon/Getty Images) (Valerie Macon/Getty Images)
Through the years Actress Brenda Song arrives at the NYLON & YouTube Young Hollywood Party at the Roosevelt Hotel on May 12, 2010 in Hollywood, California. (Photo by Frazer Harrison/Getty Images) (Frazer Harrison/Getty Images)
Through the years Actress Brenda Song and Trace Cyrus pose at the NYLON & YouTube Young Hollywood Party at the Roosevelt Hotel on May 12, 2010 in Hollywood, California. (Photo by Frazer Harrison/Getty Images) (Frazer Harrison/Getty Images)
Through the years Actress Brenda Song arrives at Stand Up To Cancer held at Sony Pictures Studios on September 10, 2010 in Culver City, California. (Photo by Frederick M. Brown/Getty Images) (Frederick M. Brown/Getty Images)
Through the years Actress Brenda Song attends the premiere of "The Social Network" during the 48th New York Film Festival at Alice Tully Hall, Lincoln Center on September 24, 2010 in New York City. (Photo by Neilson Barnard/Getty Images) (Neilson Barnard/Getty Images)
Through the years Brenda Song attends 2016 CBS Upfront at The Plaza on May 18, 2016 in New York City. (Photo by Matthew Eisman/Getty Images) (Matthew Eisman/Getty Images)
Through the years Actress Brenda Song speaks onstage at the 'Pure Genius' panel discussion during the CBS portion of the 2016 Television Critics Association Summer Tour at The Beverly Hilton Hotel on August 10, 2016 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images) (Frederick M. Brown/Getty Images)
Through the years In this handout photo provided by Disney Parks, actress Brenda Song celebrates her 31st birthday at Disneyland on March 27, 2019 at Disneyland in Anaheim, California. (Photo by Joshua Sudock/Disney Parks via Getty Images) (Handout/Getty Images)
Through the years Actress Brenda Song visits 'The IMDb Show' on July 16, 2019 in Studio City, California. This episode of 'The IMDb Show' airs on July 25, 2019. (Photo by Rich Polk/Getty Images for IMDb) (Rich Polk/Getty Images for IMDb)
Through the years Brenda Song attends the Hulu 2019 Summer TCA Press Tour at The Beverly Hilton Hotel on July 26, 2019 in Beverly Hills, California. (Photo by Phillip Faraone/Getty Images for Hulu) (Phillip Faraone/Getty Images for Hulu)
Through the years (L-R) Brenda Song, Esther Povitsky, and Kat Dennings attend Refinery29's 29Rooms Los Angeles: Expand Your Reality Experience 2019 on November 08, 2019 in Los Angeles, California. (Photo by Presley Ann/Getty Images for Refinery29) (Presley Ann/Getty Images)
Through the years Brenda Song attends The Paley Honors: A Special Tribute To Television's Comedy Legends at the Beverly Wilshire Four Seasons Hotel on November 21, 2019 in Beverly Hills, California. (Photo by David Livingston/Getty Images) (David Livingston/Getty Images)
Through the years Brenda Song arrives at Gucci Love Parade on November 02, 2021 in Los Angeles, California. (Photo by Rich Fury/Getty Images for Gucci) (Rich Fury/Getty Images for Gucci)
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