Elon Musk’s 3-year-old son, X Æ A-Xii, steals the show at starry NYC premiere

Elon Musk’s 3-year-old son, X Æ A-Xii, stole the show at the premiere of the new PBS series “A Brief History of the Future.”

At the event, held at MoMA, a spy said that X — Musk’s son, not his social media platform — “giggled in the front row and, with uncanny timing, laughed at Seth Meyers’ jokes.”

The talk show host led a panel discussion with “Future” host Ari Wallach and director Andrew Morgan. A spy said, “Elon’s son was so cute and laughing so loud, wearing a Tesla long-sleeve shirt.”

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The Musks also attended a Lobster Club after-party, where “they both snacked on sushi and passed apps,” a source said, among guests including director Darren Aronofsky, artist Dustin Yellin, “Free Solo” filMMAker Chai Vasarhelyi, producer Celine Rattray and Indré Rockefeller.

The billionaire dad, 52, also “drank one of the night’s themed cocktails and looked very relaxed,” said our spy. “He was super friendly to everyone . . . His son played with Ari Wallach’s son. He stayed for a few hours and left before dessert. He definitely had a lot of security — but they gave him space to enjoy the party.”

X’s mother, of course, is alt-pop musician Grimes, one of three women Musk has 10 kids with.

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Musk also spent time with X at the Formula 1 Grand Prix in Austin, Tex., last October — where the toddler was spotted on his dad’s shoulders, and in a Golf cart.

They also rang in the New Year together on St. Bart’s, Musk has said.

Musk and Grimes have been in a custody back-and-forth over their three kids: X Æ A-Xii, Exa Dark Sideræl, 2, and Techno Mechanicus, 1.

Grimes has more recently been dating Anyma, a DJ and music producer who was previously married to Vittoria Ceretti — who is now dating Leonardo DiCaprio.

The singer and the tech mogul dated off and on for four years, and she confirmed in March 2022 that they had split for good after welcoming their second child together.