EXCLUSIVE: Macaulay Culkin and Brenda Song are dating, show PDA during theme park date: Pics!

Looks like Macaulay Culkin and Brenda Song are definitely an item!

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. 

"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. Culkin and Song are both starring in Green‘s upcoming directorial debut, Changeland.

50 PHOTOS
Macaulay Culkin through the years
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Macaulay Culkin through the years
HOME ALONE 1990 TCF film with Macaulay Culkin at right
UNCLE BUCK (1989) MACAULAY CULKIN, JEAN KELLY, JOHN CANDY, GABY HOFFMANN UNB 001
PARTY MONSTER (2003) MACAULAY CULKIN PTYM 001-030
THE PAGEMASTER (1994) ANIMATION MACAULAY CULKIN PGM 075
HOME ALONE (1990) MACAULAY CULKIN, DANIEL STERN, JOE PESCI HMA 027
HOME ALONE -1990 MACAULAY CULKIN
HOME ALONE -1990 MACAULAY CULKIN
THE GOOD SON (1993) MACAULAY CULKIN GDS 014
NEW YORK, NY - OCTOBER 09: Macaulay Culkin attends The Adult Swim RobotChicken Panel At New York Comic Con 2014 at Jacob Javitz Center on October 10, 2014 in New York City. 24884_010_518.JPG (Photo by Astrid Stawiarz/WireImage 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. (Photo by Daniel Boczarski/Redferns via Getty Images)
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. (Photo by Daniel Boczarski/Redferns via Getty Images)
AUSTIN, TX - JANUARY 31: Macaulay Culkin performs with Pizza Underground at Unconventional Oven on January 31, 2014 in Austin, Texas. (Photo by Gary Miller/FilmMagic)
NEW YORK, NY - OCTOBER 11: (L-R) Seth Green, Matthew Senreich, Doc Hammer, Breckin Meyer, and Macaulay Culkin speak at the Robot Chicken Panel during New York Comic Con 2013 at the Javits Center on October 11, 2013 in New York City. 24181_002_0326.JPG (Photo by Mike Coppola/WireImage)
PARIS, FRANCE - MARCH 29: Macaulay Culkin attends the 50th Foire du Trone - Opening Night at Pelouse De Reuilly on March 29, 2013 in Paris, France. (Photo by Dominique Charriau/WireImage)
Actors Macaulay Culkin and Matthew Broderick (R) applaud as they present tribute to late director John Hughes onstage during the 82nd Annual Academy Awards held at Kodak Theatre on March 7, 2010 in Hollywood, California. (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)
HOLLYWOOD - MARCH 07: (EDITORS NOTE: NO ONLINE, NO INTERNET, EMBARGOED FROM INTERNET AND TELEVISION USAGE UNTIL THE CONCLUSION OF THE LIVE OSCARS TELECAST) 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)
LOS ANGELES, CA - SEPTEMBER 03: 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)
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. (Photo by David Livingston/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. (Photo by David Livingston/Getty Images)
KINGS -- 'Judgement Day' Episode 106 -- Airdate 04/12/2009 -- Pictured: Macaulay Culkin as Andrew Cross (Photo by Nicole Rivelli/NBC/NBCU Photo Bank via 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. (Photo by David Livingston/Getty Images)
Macaulay Culkin and girlfriend Mila Kunis during Ubid.com Joins Forces with Hollywood Stars to Launch Celebrity Auction to Benefit Hurricane Victims - Inside at Empire Ballroom in Las Vegas, Nevada, United States. (Photo by Chris Polk/FilmMagic)
Macaulay Culkin (Photo by Bruce Gifford/FilmMagic)
LAS VEGAS - OCTOBER 15: Actor Macaulay Culkin arrives at the launch of the 'uBid for Hurricane Relief' charity auction and benefit at the Empire Ballroom October 15, 2005 in Las Vegas, Nevada. All of the proceeds from the auction will be split evenly between the Brett Favre Fourward Foundation, the RockWorks Foundation and the Child Welfare League of America. The organizations will use money raised to help areas in the Gulf Coast devastated by Hurricane Katrina and Hurricane Rita. The online part of the auction continues on uBid.com through November 1, 2005. (Photo by Ethan Miller/Getty Images)
Macaulay Culkin during MTV's 'TRL' at Skywalker Ranch for 'Star Wars III: Revenge of the Sith' Screening at Skywalker Ranch in Nicosia, California, United States. ***Exclusive*** (Photo by Jeff Kravitz/FilmMagic, Inc)
Patrick Fugit, Mandy Moore and Macaulay Culkin during 'Saved' Los Angeles Premiere - After Party at Beverly Hills High School in Beverly Hills, California, United States. (Photo by L. Cohen/WireImage)
NEW YORK - JUNE 3: Actor Macaulay Culkin attends the Special Performance of Embedded at the Public Theater on June 3, 2004 in New York City. (Photo by Thos Robinson/Getty Images)
BEVERLY HILLS, CA - MAY 13: Actors Macaulay Culkin (L), Seth Green and Wilmer Valderrama pose at the after-party for United Artists' 'Saved' at the Beverly Hills Community Sports Center on May 13, 2004 in Beverly Hills, California. (Photo by Kevin Winter/Getty Images)
BEVERLY HILLS, CA - MAY 13: Actors Macaulay Culkin (L), Jena Malone and Mandy Moore pose at the after-party for United Artists' 'Saved' at the Beverly Hills Community Sports Center on May 13, 2004 in Beverly Hills, California. (Photo by Kevin Winter/Getty Images)
Macaulay Culkin walking his dog in the park wearing his favorite sweatshirt and hat from 'Foster Hall', the title of the new television pilot he just finished for NBC. (Photo by RJ Capak/WireImage)
Macaulay Culkin (Photo by Mychal Watts/WireImage)
Macaulay Culkin during The Opening Night Gala of OUTFEST, featuring 'Party Monster' in Los Angeles, California, United States. (Photo by Gregg DeGuire/WireImage)
BERLIN - FEBRUARY 9: (L-R) Actor Seth Green and actor Macaulay Culkin field questions from reporters at the 53rd Berlinale Film Festival February 9, 2003 in Berlin, Germany. Green and Culkin are promoting their new film, 'Party Monster' at the film festival. (Photo by Kurt Vinion/Getty Images)
Macaulay Culkin, Doug Flutie and guest during 'Night of Too Many Stars' Evening to Benefit The Autism Coalition at Roseland Ballroom in New York City, New York, United States. (Photo by Dimitrios Kambouris/WireImage)
WILL & GRACE -- 'May Divorce Be with You' Episode 22 -- Pictured: (l-r) Eric McCormack as Will Truman, Macaulay Culkin as Jason 'J.T.' Towne, Megan Mullally as Karen Walker -- Photo by: Chris Haston/NBCU Photo Bank
WILL & GRACE -- 'May Divorce Be with You' Episode 22 -- Pictured: (l-r) Eric McCormack as Will Truman, Macaulay Culkin as Jason 'J.T.' Towne -- Photo by: Chris Haston/NBCU Photo Bank
WILL & GRACE -- 'May Divorce Be with You' Episode 22 -- Pictured: (l-r) Macaulay Culkin as Jason 'J.T.' Towne, Eric McCormack as Will Truman -- Photo by: Chris Haston/NBCU Photo Bank
WILL & GRACE -- 'May Divorce Be with You' Episode 22 -- Pictured: (l-r) Macaulay Culkin as Jason 'J.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/WireImage)
Dylan McDermott and Macaulay Culkin at the Chrysler Lounge Backstage Creations Talent Retreat at the Chrysler Million Dollar Film Festival (Photo by L. Busacca/WireImage)
Macaulay Culkin and Chloe Sevigny during 2003 Park City - The Chrysler Million Dollar Film Festival at The Chrysler Lounge in Park City, Utah, United States. (Photo by Dimitrios Kambouris/WireImage)
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. (Photo by Frazer Harrison/Getty Images)
PARK CITY, UT - JANUARY 22: Actors Macaulay Culkin (R) and Seth Green pose with Special Olympics athlete Bart Banson at the Playstation 2 stop on Main street during the Sundance Film Festival on January 22, 2003 Park City , Utah. (Photo by Frazer Harrison/Getty Images)
Macaulay Culkin during 2003 Sundance Film Festival - 'Party Monster' - Portraits at Yahoo Movies Portrait Studio in Park City, Utah, United States. (Photo by J. Vespa/WireImage)
Macaulay Culkin during 'Igby Goes Down' Screening at United Artists Theatre in Southhampton, New York, United States. (Photo by Dimitrios Kambouris/WireImage)
(EXCLUSIVE, Premium Rates Apply) Macaulay Culkin (Photo by J. Vespa/WireImage)
Macaulay Culkin during Book Party for Ethan Hawke's 'Ash Wednesday' at Hudson Library/Hudson Hotel in New York, New York, United States. (Photo by Sylvain Gaboury/FilmMagic)
NEW YORK CITY - JUNE 22: Macaulay Culkin attends the screening party for 'Party Monster' on June 22, 2002 at Eugene's in New York City. (Photo by Ron Galella, Ltd./WireImage)
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Macaulay Culkin Gets Matching Tattoos With Goddaughter Paris Jackson: See the Pics

"They all looked super comfortable together and like they were having a great night out," the source says.

Culkin, 37, and Song, 29, clearly had fun together riding the amusement park rides, including roller coasters GhostRider and the Silver Bullet. During GhostRider, Song adorably held on to Culkin's arm.

ET has reached out to their reps for comment.

ET's Katie Krause spoke to Song on Friday at Knott's Scary Farm, where the former Disney star talked about her upcoming film with Culkin.

"It's basically about a guy who is going on a planned a trip with his wife, finds out that she's cheating on him, and his best friend jumps in last minute, and it's their adventures in Thailand and the people they sort of come across, and the crazy adventures that happen when you go on a trip across the world," Song explained. "It's been incredible. We spent five weeks in Thailand shooting this. Seth directed and wrote and starred in it, and this has been in the making for the last seven years, so he made it happen, it was incredible -- it was like, Changeland for me. That sounds super cheesy but, like, I came back like a different person." 

She also talked about Green getting the notoriously private Culkin to star in his film. 

23 PHOTOS
Brenda Song out and about
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Brenda Song out and about
BUENA PARK, CA - SEPTEMBER 29: Actress Brenda Song attends Knott's Scary Farm and Instagram Celebrity Night at Knott's Berry Farm on September 29, 2017 in Buena Park, California. (Photo by Barry King/Getty Images)
PURE GENIUS -- 'Lift Me Up' Episode 113 -- Pictured: Brenda Song as Angie Cheng -- (Photo by: Sonja Flemming/CBS/Universal Television/NBCU Photo Bank via Getty Images)
BUENA PARK, CA - FEBRUARY 04: Brenda Song attends the Knott's Berry Farm + Susan G. Komen #ScreamAgainstBreastCancer at Knott's Berry Farm on February 4, 2017 in Buena Park, California. (Photo by Greg Doherty/Getty Images)
SUPERSTORE -- 'Glenn's Kids' Episode 219 -- Pictured: (l-r) Brenda Song as Kristen, Ben Feldman as Jonah -- (Photo by: Evans Vestal Ward/NBC/NBCU Photo Bank via 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. (Photo by Paul Archuleta/FilmMagic)
Actresses Brenda Song (L) and Odette Annable attend the screening of CBS Television's 'Pure Genius' during The Tenth Annual PaleyFest Fall TV Previews presented by The Paley Center For Media, in Beverly Hills, California, on September 12, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
LOS ANGELES, CA - SEPTEMBER 09: Brenda Song attends Hollywood Unites for the 5th Biennial Stand Up To Cancer (SU2C), A Program of The Entertainment Industry Foundation (EIF) at Walt Disney Concert Hall on September 9, 2016 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
PURE GENIUS -- 'Bunker Hill, We Have a Problem' Episode 105 -- Pictured: Brenda Song as Angie Cheng -- (Photo by: Bill Inoshita/CBS/Universal Television/NBCU Photo Bank via Getty Images)
WEST HOLLYWOOD, CA - AUGUST 10: Brenda Song attends the CBS, CW, Showtime Summer TCA Party at Pacific Design Center on August 10, 2016 in West Hollywood, California. (Photo by JB Lacroix/WireImage)
BEVERLY HILLS, CA - AUGUST 10: Brenda Song from CBS's 'Pure Genius' poses for a portrait at the 2016 Summer TCAs Getty Images Portrait Studio at the Beverly Hilton Hotel on August 10th, 2016 in Beverly Hills, California (Photo by Maarten de Boer/Getty Images)
WEST HOLLYWOOD, CA - JUNE 02: Actress Brenda Song attends the 4th annual CBS Television Studios Summer Soiree at Palihouse on June 2, 2016 in West Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - MAY 18: Actress Brenda Song attends the 2016 CBS Upfront at The Plaza on May 18, 2016 in New York City. (Photo by Jemal Countess/Getty Images)
LOS ANGELES - NOVEMBER 4: 'Bite Flight Wing-Man Bonnie' -- Heather and Tim finally find another couple they actually like to socialize with, but Sophia and their son don't hit it off. Also, Greg insists he and Jen take separate flights in case something happens to the plane, Matt and John take Gary (Martin Mull) out to meet women, and Matt's ex-wife, Bonnie (Brenda Song), surprises him with a visit, on LIFE IN PIECES, Thursday, Jan. 7 (8:31-9:01 PM, ET/PT) on the CBS Television Network. NFL Hall of Famer Marshall Faulk guest stars as himself. Academy Award winner Helen Hunt directed the episode. Bonnie (Brenda Song), shown. (Photo by Neil Jacobs/CBS via Getty Images)
SANTA MONICA, CA - OCTOBER 18: Actress Brenda Song arrives at the 10th Annual Pink Party held at Santa Monica Airport on October 18, 2014 in Santa Monica, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - JULY 03: Brenda Song is seen in Los Angeles on July 03, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - JUNE 20: Actress Brenda Song attends Marc By Marc Jacobs Fall/Winter 2014 Preview at Marc Jacobs on June 20, 2014 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
BEVERLY HILLS, CA - JUNE 18: Brenda Song attends Vanity Fair And Vera Wang Celebrate The Opening Of Vera Wang On Rodeo Drive on June 18, 2014 in Beverly Hills, California. (Photo by Stefanie Keenan/Getty Images for Vanity Fair)
PASADENA, CA - JANUARY 13: Actress Brenda Song attends the FOX All-Star 2014 winter TCA party at The Langham Huntington Hotel and Spa on January 13, 2014 in Pasadena, California. (Photo by Jason LaVeris/FilmMagic)
DADS: Brenda Song in the 'Eli Nightingale' episode of DADS airing Tuesday, Jan. 14, 2014 (8:00-8:30 PM ET/PT) on FOX. (Photo by FOX via Getty Images)
SANTA MONICA, CA - OCTOBER 19: Actress Brenda Song attends the 2013 Pink Party at Hangar 8 on October 19, 2013 in Santa Monica, California. (Photo by Jason LaVeris/FilmMagic)
DADS: Brenda Song in the 'Foul Play' episode of DADS airing Tuesday, Nov. 5, 2013 (8:00-8:30 PM ET/PT) on FOX. (Photo by FOX via Getty Images)
SANTA MONICA, CA - SEPTEMBER 09: Actress Brenda Song arrives at the Fox Fall Eco-Casino Party at The Bungalow on September 9, 2013 in Santa Monica, California. (Photo by Kevin Winter/Getty Images)
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"Seth and Him had done Party Monster together so they had been friends forever, so I think that's probably how he got [him] in, but it was a wonderful experience," she said. "Everyone was great ... we had the best time ever. Everyone was lovely, we just got to go to Thailand and hang out with our best friends for five weeks."

Culkin and Song first sparked dating rumors when they were snapped at celeb hot spot Craig's in Los Angeles in July. However, Song declined to comment on the romance rumors on Friday.

Macaulay Culkin Steps Out to Dinner With Brenda Song in Rare Appearance: Pics!

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