The co-defendant in the the Tulisa Contostavlos trial has also walked free after the judge decided the case against him could not proceed.
Rapper Michael Coombs, whose stage name is Mike GLC, had pleaded guilty before the trial to supplying half a gram of cocaine to undercover reporter Mazher Mahmood.
On hearing the decision the 36-year-old reportedly wept and hugged his defence barrister, Jeremy Dein QC.
More top news
A plasterer who murdered his twin brother in a drunken fight on New Year's Eve has been given a life sentence.
The Duchess of Cambridge has made her first public appearance since her pregnancy was announced.
The bookseller clearly knows a good PR opportunity when it sees one.