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Barron Trump was a happy guy at his belated 11th birthday party at Bowlmor Chelsea Piers on Thursday.

He celebrated with his mom, first lady Melania Trump, half-sister Tiffany and classmates.

“He was very happy, goofing around and laughing with his friends. They got super-competitive with the bowling scores. Tiffany joined in the competition and bowled with them,” a source said.

We’re told stylish FLOTUS was in heels and did not bowl.