Britney Spears has reportedly been captured on video in a state of and indulging in some "serious partying" with the two nightclub dancers she swapped clothes with on a recent night out.The 'Toxic' singer - who is currently being treated in Malibu's Promises rehab centre for alcoholism - swapped her red dress for a bikini and fishnets with two dancers at New York's One nightclub on February 12.Their wild antics are said to have been captured on CCTV.A source told the New York Daily News newspaper: "The manager said there was a tape of them doing some serious partying with Britney. Both the girls cried about it when they got fired, but they didn't deny it."If it goes on the internet it might be just what the authorities need to take Britney's children away from her."A representative for the club said: "The two girls were absolutely not fired and there were not any cameras in the area behind the coat check where they changed."But the source insisted: "Yes there are. There's a camera above the office back there that can see that whole room."