Tulisa Contostavlos has denied being concerned with the supply of Class A drugs.
The singer, who appeared before Westminster Magistrates’ Court this morning, pleaded not guilty to all charges.
Musician Michael Coombs, 35, who also uses the name Mike GLC, pleaded not guilty to the same charge.
Senior District Judge Howard Riddle granted both unconditional bail.
The case will be sent to Southwark Crown Court, where they will appear on 9 January 2014.
The former X Factor judge, 25, was remanded in custody on 4 June, along with musican Mike GLC, 35, after they went to a police station in central London by appointment. She was officially charged on Monday 9 December.
Tulisa’s lawyer, Ben Rose of Hickman and Rose, released the following statement regarding his client:
“Tulisa has been charged with a serious criminal offence to which she will plead not guilty.
“As has been widely reported, this entire case has been manufactured by the Sunday Sun 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 £3million 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 the 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.
“The law clearly forbids such conduct on the part of the police. It is ironic that the police should rely on it when it is the work of a journalist.
“In due course Tulisa will give a full answer to these allegations in court.”
Baljit Ubhey, CPS London Chief Crown Prosecutor, confirmed earlier today: “The Crown Prosecution Service has today authorised the Metropolitan Police Service to charge Tulisa Contostavlos, 25, with being concerned in the supply of Class A drugs.”
“This charge relates to an investigation by The Sun newspaper between early March 2013 and 23 May 2013 which resulted in the supply of Class A drugs to an investigative journalist.
“This decision to prosecute was taken in accordance with the Code for Crown Prosecutors.
“We have determined that there is sufficient evidence for a realistic prospect of conviction and that a prosecution is in the public interest.
“Ms Contostavlos will appear before Westminster Magistrates' Court on 19 December 2013.”
The Sun On Sunday reported that half an ounce of cocaine changed hands as a result of the deal conducted at London's Dorchester Hotel earlier this year.
The Metropolitan Police confirmed at the time: “We have received information concerning the alleged supply of illegal drugs at a central London location.
”We are considering the information received.“
The singer - who found fame with N-Dubz - was officially dropped as a judge on The X Factor following the arrest, with Sharon Osbourne returning to the show in her place.
The star - whose debut solo album made it to only number 35 in the charts - said that she did not take the drug herself.
Contostavlos last year won an apology from a former boyfriend who leaked footage on to the internet of the two of them performing a sex act.
Pictures of the year: World News 2013
Pictures of the year: World News 2013
A relative of a victim weeps by flowers put in front of the Kiss nightclub in Santa Maria, southern Brazil where a blaze left a death toll of over 230
A view of the wall of a local zinc plant which was damaged by a shock wave from a meteor in the Urals city of Chelyabinsk. A meteor strike in central Russia that left hundreds of people injured is the biggest known human toll from a space rock
Newly elected Pope Francis I appears on the central balcony of St Peter's Basilica in Vatican City, Vatican. Argentinian Cardinal Jorge Mario Bergoglio was elected as the 266th Pontiff and will lead the world's 1.2 billion Catholics
People visit a make-shift memorial on Boylston Street near scene of Boston Marathon explosions, which killed 3 people and injured estimated 265
Danielle Stephan holds boyfriend Thomas Layton as they pause between salvaging through the remains of a family member's home after a tornado devastated the town Moore, Oklahoma. Rescuers went building to building in search of victims and thousands of survivors were homeless after a massive tornado tore through the Oklahoma City suburb of Moore, wiping out whole blocks of homes and killing at least 24 people
An Egyptian holds up posters during a protests against President Mohamed Morsi and the Muslim Brotherhood as they joined thousands at Egypt's landmark Tahrir square in Cairo. Egypt braced for mass rallies with President Mohamed Morsi's opponents determined to oust him and his Islamist supporters vowing to defend his legitimacy to the end, stoking fears of a violent first anniversary of his taking office
A crane removes a derailed train's car at the site of the Spain's deadliest rail disaster, near the city of Santiago de Compostela. A train hurtled off the tracks in northwest Spain killing at least 77 passengers and injuring more than 140
US Army Private First Class Bradley Manning was found guilty of several counts under the Espionage Act and sentenced to 35 years in prison for passing hundreds of thousands of classified military documents to WikiLeaks
Pakistani earthquake survivors rest near their collapsed mud houses in the earthquake-devastated district of Awaran. The death toll from a major earthquake that hit southwestern Pakistan rose to almost 400
Demonstrators stand atop a monument during a teachers protest demanding better working conditions and against police beating in Rio de Janeiro, Brazil
A boy who was wounded by flying debris due to Super Typhoon Haiyan stays at the ruins of his family's house in Tacloban city. Haiyan, one of the most powerful storms ever recorded killed at least 10,000 people in the central Philippines province of Leyte with coastal towns and the regional capital devastated by huge waves
Nelson Mandela passed away at his home in Houghton at the age of 95. People passed the casket to pay their respects as former South African President Nelson Mandela laid in state at the Union Buildings in Pretoria
Video: Tulisa arrives at Westminster Magistrates court