A source tells us that the duo was seen being "affectionate," holding hands and on a double date with Seth Green and his wife Clare Grant.
This news comes a little over a month after Song posted a photo with Macaulay on Instagram. 22, the duo can be seen celebrating with friends, including Green.
He sported a shorter haircut with a blue button-down shirt and jeans.
Song rocked black leather shorts and a loose top with a gray sweater and heels.
Macaulay and Brenda looked like the epitome of loved up as they strolled around the capital arm in arm, with the actor looking decidedly happier than his recent troubled years.
Smitten in love, the duo who have been dating for four months appeared besotted, barely able to keep their hands off each other as they were spotted embracing frequently and gazing into each others’ eyes, holding hands at every opportunity.
The former child actor looked fit and clean cut both while out on the town.(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." Song responded, "Ah, I don't like to talk about my personal life." However, when pressed for more details, the actress didn't deny rumors that she was romantically involved with him.A few weeks ago, Song posted a photo on Instagram that showed her posing with a group of friends, which included Seth Green and Macaulay Culkin, after attending Summer Slam 2o17.Macaulay was previously married to actress Rachel Miner, who he tied the knot with in 1998, but the pair separated in 2000 and divorced two years later.