T.' Towne, Megan Mullally as Karen Walker -- Photo by: Chris Haston/NBCU Photo Bank Macaulay Culkin, Wilmer Valderrama and Seth Green during 2003 Park City - The Chrysler Million Dollar Film Festival at The Chrysler Lounge in Park City, Utah, United States.(Photo by Dimitrios Kambouris/Wire Image)PARK CITY, UT - JANUARY 22: Actor Macaulay Culkin (C) poses with Special Olympics athlete Bart Banson (L) and a fan at the Playstation 2 stop on Main street during the Sundance Film Festival on January 22, 2003 Park City , Utah.Komen #Scream Against Breast Cancer at Knott's Berry Farm on February 4, 2017 in Buena Park, California.(Photo by Greg Doherty/Getty Images)LOS ANGELES, CA - SEPTEMBER 16: Actress Brenda Song attends Entertainment Weekly's 2016 Pre-Emmy party at Nightingale Plaza on September 16, 2016 in Los Angeles, California."Parkgoers said they were very cute with each other holding hands and very affectionate," the source says."Looked like they were having a great time."Culkin appeared to be on a double date with his close friend, actor Seth Green, and his wife, Clare Grant, according to our source.(Photo by David Livingston/Getty Images)CULVER CITY, CA - SEPTEMBER 19: Actor Macaulay Culkin arrives at the opening night performance of 'Clay' at CTG's Kirk Douglas Theatre on September 19, 2007 in Culver City, California.(Photo by Ryan Miller/Getty Images)LOS ANGELES - MARCH 18: 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.
Culkin and Song attended Instagram's Knott's Scary Farm celebrity night on Saturday, where a source tells ET the two were very "affectionate" with one another and openly held hands.
Culkin and Song are both starring in Green‘s upcoming directorial debut, NEW YORK, NY - OCTOBER 09: Macaulay Culkin attends The Adult Swim Robot Chicken Panel At New York Comic Con 2014 at Jacob Javitz Center on October 10, 2014 in New York City. JPG (Photo by Astrid Stawiarz/Wire Image for Turner Networks)CHICAGO, IL - SEPTEMBER 13: Macaulay Culkin of The Pizza Underground performs on stage at Riot Fest Chicago 2014 at Humboldt Park on September 13, 2014 in Chicago, United States.