They decked the halls — and each other.

A ritzy Nantucket Christmas celebration erupted into mayhem as men decked out in “Ralph Lauren and Burberry” traded blows just moments after Santa Claus made his appearance, according to shocking footage.

The wild brawl broke out on Federal Street Saturday afternoon during the Massachusetts island’s 51st Annual Christmas Stroll, where hundreds had gathered to visit local businesses in one of America’s priciest small towns, the Nantucket Current reported.

In dramatic video shared with the outlet , about a dozen men — ranging in age from 20s to 60s — were seen arguing and shoving each other in the middle of the street before breaking into small groups, where the aggression continued to escalate.

“All of the sudden there were two groups,” a witnes

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