TSGConsumer Partners, a New York private equity firm, has aquired a minority stake in ELF Cosmetics. Over the years, TSG was involved with Smashbox, which sold its cosmetics line to Estée Lauder Cos. Inc., andh Pureology, which was acquired by L’Oréal. Today, TSG has interests in Perricone MD and Alterna. According to TSG, its investment should help ELF grow its mass market beauty business via the internet, in more brick-and-mortar stores and through larger international distribution ...