X Factor judge Tulisa Contostavlos has spoken about for the first time about suffering a sex attack when she was 16 years old.

The N-Dubz singer turned talent show mentor revealed the traumatic experience in her new autobiography, Honest, saying that the assault happened on a night out during which her friends were spiking other people’s drinks.

Despite saying she did not want to be involved, Tulisa recalls that she felt ‘abormally drunk’ and blacked out during the party.

She then woke in a bedroom to find a friend of hers having sex with her.

“I couldn’t even move, let alone get up or speak, and once again I just blacked out,” she said.

“I realise now, of course, that I’d done nothing to be ashamed of and the boy in question should have been prosecuted, but I was young and confused and not strong enough to speak up.”

The book, which is being serialised in The Sun this week, also sees Tulisa discussing her involvement in a girl gang which took part in criminal activity.

Although she admits she is glad to have left her old life behind, she said that it still ‘feels normal’ for her.