The environmentalist left a Carbone footprint.

Leonardo DiCaprio had a private dinner with Kate Moss, Sean Penn, Benicio del Toro and Tobey Maguire at Carbone London — days before the restaurant officially opened to the public, Page Six has exclusively learned.

A source confirmed that DiCaprio and his A-list pals “slipped in for a sneak peek of the restaurant” on Monday night ahead of the Italian eatery’s official launch in London’s buzzy Mayfair neighborhood.

They were “all dining together” and went “unnoticed,” the source said of the Hollywood heavyhitters, adding that the group was “super discreet.”

The “Titanic” star, 50, and his famous friends enjoyed a preview of Major Food Group’s new menu featuring classic dishes like Spicy Rigatoni Vodka, Veal Parmesan and tableside-prepared C

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