Kyle Richards and Mauricio Umansky Sell Bel-Air Mansion for Millions

Kyle Richards and her hubby Mauricio Umansky have sold their Bel-Air mansion and are now $6.1 million richer ... TMZ has learned. The 7 bedroom, 9 bath estate is all about luxury ... it's 6,229 square ft. and comes with a theater, office, pool and…