The city’s swankiest tweens lived it up over the weekend at dueling lavish bar mitzvahs, we hear.

Uptown, Cantor Fitzgerald CEO Howard Lutnick’s son Ryan was fêted at the Metropolitan Museum’s Temple of Dendur — the same setting as Vogue’s annual Met Gala — with music by Rich the Kid and DJ Irie.

An insider told us the performance by Kid probably cost “between $200,000 and $300,000.”

One hundred kids attended with 200 adults, including Duchess of York Sarah Ferguson, Melania Trump’s former adviser Stephanie Winston Wolkoff and publicist

Alison Brod, taking part in the festivities that included catering by Paris’ iconic Caviar Kaspia.

Meanwhile, at Tao, we hear another birthday boy, named Jake, entered his bar mitzvah flanked by the Knicks City Dancers.

Cardi B performed at the downtown bash, calling it “epic” on Instagram.

As far as her fee, a source told Page Six that the rapper “wouldn’t get out of bed for less than half a million.”

Guests were fed an array of goodies from different Tao Group restaurants including Lavo, and Artichoke Pizza.

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