Mauricio Umansky let loose with a much younger woman days before he’s set to spend the holidays with his family, and allegedly his estranged wife, Kyle Richards, RadarOnline.com can reveal. The Agency mogul, 53, was caught dancing shirtless and spraying 30-year-old singer and YouTube star Anitta while away in Aspen ahead of the long weekend. Umansky — who’s been separated from his wife of nearly 30 years for months — looked like a joyful spring breaker while dancing on tables and pouring champagne down partiers’ throats with a scantily-clad Anitta nearby on Thursday. Sporting lime green snow p…