Police are making enquiries after a blogger accused former X Factor judge Tulisa Contostavlos of punching him and hurling drunken abuse at V Festival in the early hours of Sunday.
Vas Morgan claims the star charged towards him in a "drunken and angry state" and that she punched him in the eye before "hurling abusive threats".
Contostavlos' representative said: "Tulisa strongly denies assaulting Mr Morgan - she specifically denies punching Mr Morgan."
Essex Police have confirmed that they received an allegation of assault "alleged to have occurred at around midnight on Saturday at the V Festival".
"We are making further enquiries," a spokeswoman said.