After instantaneously being ordained New York’s hottest club — following its grand opening Friday after two years in the making — André Saraiva’s Le Baron is launching a concert series called, “Encore!” Backed by Absolut and Spin magazine, it kicks off Monday with a show by HeartsRevolution, a Lower East Side band so painfully hip it has its own ice cream trucks. The “Encore!” series aims to showcase emerging talent, and seven more gigs have been booked, running through May 14. Le Baron is the Chinatown outpost of Saraiva’s famed Paris boite. The “Encore!” shows are being filmed and will be made available on Absolut’s Facebook page and Spin’s Web site.