Tulisa Contostavlos has announced a new memoir that will detail the highs and “unimaginable lows” of her music career, including her collapsed drugs trial in 2014.

The pop singer, 36, who found fame in hip-hop trio N-Dubz , was arrested on suspicion of supplying class A drugs in 2013, but the charges were later dismissed after prosecution witness, “fake sheikh” journalist Mazher Mahmood , was found guilty of tampering with evidence in the trial.

The book, titled Judgement, has been written using journals that Contostavlos wrote in amid the media storm following the sting operation that saw Mahmood pose as a wealthy film producer called Samir Khan.

In an Instagram video on Tuesday, Contostavlos said: “90% of this no one has ever known.

“The story of my year in 2013 has been spoken

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