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The N-Dubz star, 25, of Friern Barnet, north London, is accused of setting up an £860 deal to supply 13.9 grams of cocaine to an undercover reporter.
She appeared alongside rapper Mike GLC, also known as Michael Coombs, 35, of Velocity Way, Enfield, north London, at Westminster Magistrates’ Court.
He denied a charge of supplying the drug on May 23.
Contostavlos was forced to disclose her address to the court after her solicitor applied for it to be withheld to prevent “unwanted visitors”.
But Chief Magistrate Howard Riddle ruled “the address must be given” after considering the application with representations from prosecutor Emma Scheer and the Press Association.
The singer then told the court: “Just to let you know, after it being read out, in the next month or so I might have to move to a new address.”
Contostavlos is accused of being “concerned with the supply” of cocaine to the Sun on Sunday’s undercover reporter Mazher Mahmood, sometimes known as the fake sheikh, between May 20 and May 24.
Contostavlos allegedly set up the deal after telling Mahmood she could help provide him with “white sweets”, which the court heard was a code for cocaine.
She is accused of playing a “significant role” putting the fake sheikh in touch with Coombs before the pair met at the upmarket Dorchester Hotel in central London.
Contostavlos was initially arrested with Coombs on June 4.
She was dropped as a judge on X Factor days before her arrest, with Sharon Osbourne returning in her place.
Contostavlos and Coombs were given unconditional bail by Mr Riddle and will next appear at Southwark Crown Court in central London on January 9.
Outside court her lawyer said: “Tulisa has been charged with a serious criminal offence to which today she has pleaded not guilty.
“As has been widely reported, this entire case has been manufactured by the Sun on Sunday and Mazher Mahmood, sometimes known as the fake sheikh.
“They spent a large amount of their readers’ money in flying Tulisa and a number of her friends first class to Las Vegas.
“There, Mahmood posed as a film producer offering her a £3m film contract.
“This case is not simply about drug supply. It is about the limits which we set on the conduct of journalists.
“The media have rightly been criticised in recent years for gross invasion into the private life of others.
“Tulisa is the latest in a long line of people who have been treated as fodder by greedy newspapers.
“This was a deliberate attempt to target a young woman who is all the more vulnerable because of her celebrity status.”
A Sun spokesperson defended the article, adding: “The Sun on Sunday’s investigation into Tulisa Contostavlos was entirely justified in the public interest.
“Ms Contostavlos is a self-described role model for young people and therefore has certain responsibilities.
“Throughout our investigation, our team followed the Press Complaints Commission Code and then handed over our dossier of evidence to the police.
“Following the police investigation, prosecutors have decided that there is a clear case to answer.
“It is right that this matter should go to court and be decided by a jury.
“Allegations about the conduct of this newspaper made by Ms Contostavlos’ lawyers are entirely without foundation.”