Former X Factor judge Tulisa Contostavlos has been charged with being concerned in the supply of Class A drugs.
It follows a newspaper sting in which she allegedly sold cocaine to an undercover journalist.
The Crown Prosecution Service (CPS) announced on Monday that it had authorised the Metropolitan Police to charge the former N-Dubz singer.
“This charge relates to an investigation by the Sun newspaper between early March 2013 and May 23 2013 which resulted in the supply of Class A drugs to an investigative journalist,” CPS London chief Crown prosecutor Baljit Ubhey said.
“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 at Westminster Magistrates’ Court on December 19.
“This defendant is now the subject of criminal proceedings and has the right to a fair trial,” Mr Ubhey said.
“It is extremely important that nothing should be reported which could in any way prejudice these proceedings.”
Contostavlos was initially arrested in connection with the incident with 35-year-old musician Mike GLC on June 4.
She was officially dropped as a judge on X Factor days before her arrest, with Sharon Osborne returning to the show in her place.