The N-Dubz rapper was arriving at a nightclub for a personal appearance when he is said to have clashed with the 18-year-old student.
The alleged victim called police after he was escorted out of Chicago's nightclub in Chelmsford, Essex where Dappy — real name Costadinos Contostavlos — was booked to perform at a student night.
A friend of the star denied the claims, saying he had acted 'in complete self-defence'.
An Essex Police spokeswoman said: “Costadinos Contostavlos, 26, from St Albans, Herts, has been charged with one count of assault by beating and he will appear at Chelmsford Magistrates on March 19.”
Earlier this week Dappy declared his love for his former 'Celebrity Big Brother' housemate Luisa Zissman in a magazine interview.
"Honestly? We love each other to death," he told OK! magazine. "She’s sexy.