Police arrested 22-year-old Junior Edwards on suspicion of rape and common assault and have requested to interview band members Dappy and Fazer as witnesses to the incident.
"The three members of N-Dubz were 100% not involved and there is absolutely no suggestion that they were," the statement reads.
"The police have confirmed that no-one else is being treated as suspects. Any suggestion otherwise is totally misleading in its inference. The police have asked people at the after-show party, including N-Dubz, to voluntarily give witness statements in the next few days which they of course they willingly do.
"N-Dubz are very responsible to their young fans and have naturally told Junior Edwards that he is to keep well away until the charges are dropped."
Manager Jonathan Shalit added: "Some of the pitfalls of being in a successful music act is that groupies often come back to where their icons are staying and then smelling potential opportunities to make a name for themselves and money - make false allegations. N-Dubz this week have been fronting the Beat Bullying campaign."
N-Dubz released second album Against All Odds on Monday.