US Weekly reports Justin Timberlake and Britney Spears ran into each other on August 1st for the first time since their March split, and the meeting ended in an argument and dance-off at the Lounge in Los Angeles. Britney walked into the club only to see her ex *NSYNC boyfriend dancing with girlfriend Jenna Dewan. Britney “watched them like crazy,” says a spy. Britney confronted Timberlake when he got up to get drinks. When Spears asked him if the two could talk, Justin said, “‘If it’s about us getting back together, forget it.” Britney then started complaining about how Timberlake has been “using different women for media attention.” Justin fired back about “‘her cheating, and they got into a huge argument.” When the dust settled, the two went to the dance floor “and started a dance-off.” The drama lasted about 90 minutes until Justin left at 2 a.m… without Britney.