Brotherly love!

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The “Home Alone” star revealed he “cried” when Kieran accepted the statuette, beating competitors Yura Borisov (“Anora”), Edward Norton (“A Complete Unknown”) and Guy Pearce (“The Brutalist”) for the coveted prize.

Macaulay discussed his brother’s victory at the hottest afterparty of the night — Vanity Fair’s post-Oscars bash — while walking the red carpet with his wife, actress Brenda Song.

“Just Best Supporting Actor, that’s the only thing I watched. True story, true story,” he told correspondent Tan France about watching the star-studded ceremony. “I cried,” he said about his reaction to Kieran’s win. “And I was like, ‘I’m gonna see you later.’”

This was Kieran’s first Oscar nomination and win for his role in the Jessie Eisenberg-directed film “A Real Pain.”

In the flick, Kieran plays Benji Kaplan, who takes a trip to Poland with his cousin, David (Eisenberg), to honor their grandma. However, the meaningful vacation involves several twists and turns as family tensions resurface.

Macaulay and Song said they knew all along that Kieran would walk away a winner at the 2025 Oscars. In fact, he swept award season, earning a Golden Globe, Critics Choice Award, BAFTA and Screen Actors Guild Award for his role in the movie.

When asked if they were confident in his victory, Song responded, “Of course! Come on, let’s be real. We’re allowed to say that.”

“Yeah, absolutely,” added Macaulay, noting Kieran’s close placement near the stage at the award show.

Kieran was seated in the “front row, aisle, closest to the stage,” his brother shared. “There was no way he was not going to win.”

While Macaulay and Song were celebrating Kieran’s victory at the Vanity Fair party, the Oscar winner was spotted at two separate bashes. He attended the Governors Ball at the Ray Dolby Ballroom at Dolby Theatre with his wife, Jazz Charton, before the pair headed to Searchlight Pictures’ Oscars party at Cipriani Beverly Hills.

During the night, Kieran was photographed partying with Eisenberg and “A Real Pain” producer Emma Stone, who the star credited for getting him to do the film in the first place.

When Macaulay and Song were asked if they’d be seeing Kieran on the big night, his brother laughed.

“I don’t know, he’s a busy man!” Macaulay said. “He’s Academy Award-winning actor Kieran Culkin.”

While The Post’s movie critic Johnny Oleksinski wrote the recent Oscars ceremony was a “slow” and “strange” affair, one highlight was Kieran’s speech.

When accepting his Oscar, the “Succession” alum used the moment to remind his wife what she had promised if he won the Academy Award.

“This is — please don’t play the music because I want to tell a really quick story about Jazz. About a year ago, I was on a stage like this and I very stupidly, publicly said that I want a third kid from her because she said if I won the award, I would, she would give me the kid,” he told the celebrity-filled audience, referring to his Best Lead Actor in a Drama Series win at the 75th Primetime Emmy Awards for “Succession.”

“It turns out she said that because she didn’t think I was gonna win, but then people came up to her and were like, you know, really annoying her, I think, I think it got to her, but anyway,” he continued.

“Emily, you were there, so you’re a witness, and she goes, ‘Oh God, I did say that. I guess I owe you a third kid,’ and I turned to her and I said, ‘Really I want four.’ And she turned to me, I swear to God this happened, it was just over a year ago, she said, ‘I will give you four when you win an Oscar.’ I held my hand out, she shook it, and I have not brought it up once until just now,” Kieran added.

 “You remember that, honey? You do? Then, I just have this to say to you, Jazz, love of my life, ye of little faith. No pressure. I love you. I’m really sorry I did this again. And let’s get crackin’ on those kids. What do you say? I love you!”

The pair married in 2013 and share two children — at least for now!