You don’t think a classical pianist would unwind after playing Carnegie Hall by clubbing at 1Oak. But Lola Astanova — who’s becoming nearly as known for her taste in Jimmy Choo stilettos and Dolce & Gabbana dresses as her renditions of Rachmaninoff — isn’t your usual classical musician. “Some people find house music mechanical,” the stunning Astanova, 26, told us the night after playing a tribute to her mentor, virtuoso Byron Janis, at Lincoln Center. But she explained she appreciates house music’s “freedom” from classical’s relative “structure.” And that she’s even producing some house tracks herself. “After performing, you’re just a shell,” she said, adding that she’ll go “clubbing in the Meatpacking District” to blow off steam after a show. Astanova says she doesn’t get emotional following a performance, but for her Carnegie Hall debut this year, with guests including Donald Trump and Julie Andrews, “I cried for 10 minutes afterwards.” At a dinner in her honor at Upper East Side restaurant Primola, Astanova told us she and Janis, 84, will team on a series of collaborations for YouTube. Guests at the rollicking repast hosted by Jim Mitchell included Pia Lindstrom, Patrick Park, Post Broadway columnist Michael Riedel, Grace and Chris Meigher and Ada Zambetti.