Hank Tomashevski, Anna Wintour’s private chef, created a chic Mexican fiesta in celebration of jeweler Irene Neuwirth’s CFDA nomination at the home of Barneys CEO Mark Lee Wednesday. His trick? No food that could stain Lee’s meticulously decorated Chelsea penthouse — which meant guac, but no salsa. Guests included Allison Williams, Stefano Tonchi, Nate Berkus, Jay Fielden, Reed Krakoff, Dana Auslander, Dini von Mueffling and Selby Drummond.