She’s using her platform heels — to, er, heal.

Nicky Hilton Rothschild has a “high-low” approach to fighting climate change — wear vintage Chanel and take the subway.

“I am here in support of [sustainable fashion brand] Maison de Mode … So I pulled out an old Alice + Olivia skirt and wore a vintage Chanel bag, and I took the subway here,” she told us at Fashion Group International’s Rising Star Awards at Cipriani 42nd Street. “I took the 6. I feel like I am doing my part.”

Hilton was also spotted at the opening of the Winter Show at the Park Avenue Armory — the annual art market that benefits The Bronx’s East Side House Settlement — and she reportedly said of the chic pencil skirt she was wearing while admiring a $24,000 sculpture of a cat, “It was $75 from Instagram.”