A day after they played together in a poker tournament to benefit Operation Smile, OK! has learned that Lance Bass and Reichen Lemkuhl have again called it quits. Sources tell OK! that the final straw to their recently shaky relationship was a result of a very thinly veiled blind-item posted on perezhilton.com alleging that Reichen had cheated on Lance during a recent trip to Atlanta. A few hours after the item was posted, OK! learned that the once happy couple had broken up – when witnesses saw Lance alone at a party hosted by Perez Hilton himself at the Heineken Lounge in Park City!OK! is currently seeking comments from both Lance and Reichen and will keep you posted as details develop.