Victor Wembanyama entered his twenties on Thursday ... and his teammates celebrated his special day by singing "Happy Birthday" during practice!!

The San Antonio Spurs players surprised the 7'4" rookie right on the court ... surrounding him and breaking out the classic tune.

Wemby clearly wasn't expecting it ... but jumped right into singing and clapping with his teammates.

"Hip hip hooray!" the players yelled after the song. "Hip hip hooray!"

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Wembanyama also got another nice present on his birthday -- it was announced he's received over 221k votes to participate in the 2024 NBA All-Star Game so far.

To compare, that's more entries than Karl-Anthony Towns, Chet Holmgren and Kristaps Porzingis.

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