Post Malone helps fan celebrate his 21st birthday with sweet viral video: “The nicest superstar ever”

What better way to celebrate your 21st birthday than with Post Malone?

One lucky fan of the musician had to do just that, as the star happened to crash his birthday party at sushi restaurant Matuhisa in Los Angeles.

In a TikTok video that has since gone viral, mother Nicole Schumacher captured a sweet interaction between the “Circles” singer – who she called “the nicest superstar ever” – and her son Andrew.

“I’m Austin, nice to meet you,” said Post Malone, whose real name is Austin Post, as he shook Andrew’s hand.

Schumacher then informed the 26-year-old, nine-time Grammy-nominated musician about the situation, explaining that Andrew is autistic, “knows all your songs” and is just enjoying his first beer.

“Which beer do you get? That's a tough decision,” the star joked. “Dude, thanks for listening, man. That's so sweet. Have fun, man. But not too much fun!”

The video, which has more than 6.6 million views and nearly 900,000 likes, was quickly flooded with comments from fans praising Post Malone's kindness.

“I love celebrities who are nicer than most normal people,” wrote one user, while another added, “He's a guy who got famous and rich and never forgot who he was. His music is good too.”

RELATED: Post Malone Donates 10,000 of His Sold-Out Crocs to Hospital Workers

Post Malone

Post Malone

Frazer Harrison/Getty Post Malone

Other users even seemed to have a crush on the star because of his humble nature: “I never understood why so many women were obsessed with him. Now I get it, lol.”

Another added: “I think I just fell in love with Post Malone.”

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Schumacher later posted a photo of the artist posing with Andrew on Instagram, writing: “Happy 21st birthday Andrew! First beer ever with @postmalone.”

The star released “One Right Now,” a collaboration with The Weeknd, in November and his next album, Twelve carat toothacheis due to be released sometime this year.

He also made headlines in recent weeks for donating an autographed Fender Squire guitar to the Cottonwood Heights Police Department in Utah, where he lives, to raise funds for Camp Hope Utah, an organization that helps abused children.