The tight-knit TV family hit the floor with the newlyweds and the rest of the 75 wedding guests

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The family that cries together, parties together!

The This Is Us gang — including Mandy Moore, Milo Ventimiglia, Chrissy Metz and Sterling K. Brown — was out in full celebratory force to support costar Justin Hartley at his intimate Malibu wedding on Saturday.

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After Hartley, 40, and his bride, actress Chrishell Stause, 36, did a first dance to The Contours’ “Do You Love Me”, the tight-knit TV family hit the floor with the newlyweds and the rest of the 75 wedding guests.

“They’re so happy for us!” Stause tells PEOPLE. “They’re such sweet people.”

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Credit: Allison and Brian Callaway/Callaway Gable

And sweet dancers.

While the whole cast joined in as a deejay spun an ’80s-heavy playlist, Brown busted out the most moves.

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Credit: Allison and Brian Callaway/Callaway Gable
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Credit: Allison and Brian Callaway/Callaway Gable

“Sterling and his wife got down on the dance — it was great!” a guest says. “They had so much fun!”

One especially hilarious moment came when Brown caught the garter — and playfully wore it as a head band while he danced into the night.