09/26/2011 AT 10:00 AM EDT
and L'Wren Scott
celebrated his new band SuperHeavy's album with a champagne toast at the Double Seven in N.Y.C. "Mick was working the room like a champ taking photos with lots of fans," a source inside the Belvedere-sponsored bash says. When the rocker returned, he kissed Scott on the cheek and pulled her up to dance. Says the source: "That's when the impromptu booth dance party started."