Police are investigating claims that X Factor judge and N-Dubz singer Tulisa Contostavlos assaulted a blogger at V Festival.

Celebrity writer Vas Morgan has claimed that the 25-year-old charged towards him in a ‘drunken and angry state’ in a backstage area at the Chelmsford event on August 18.

Tulisa is said to deny the assault, but Essex Police are investigating.

A force spokeswoman confirmed that officers have received the allegation of an assault. The attack is alleged to have taken place just after midnight.

She added: “We are making further inquiries.”