Mazher Mahmood, 53, was known for his scoops for The Sun on Sunday newspaper in which he would pose as a wealthy figure from the Middle East and encourage celebrities into making embarrassing revelations.
He and his driver Alan Smith deny conspiracy to pervert the course of justice over the 2014 trial of Tulisa Contostavlos, a former member of hip-hop group N-Dubz and "X Factor" talent show judge.
Contostavlos was accused of arranging for Mahmood to be supplied with half an ounce of cocaine, a story which landed him an exclusive for The Sun on Sunday and, when he handed evidence to police, led to her prosecution.
"Mazher Mahmood had a vested interest in the prosecution succeeding in terms of his reputation and his standing," lead prosecutor Sarah Forshaw told the Old Bailey central criminal court in London.
"In effect, the hearing in June 2014 put Mr Mahmood and his journalistic process on trial," she added.
"He knew that if it could be shown that he had acted improperly as an agent provocateur, inducing Miss Contostavlos to do something she would not otherwise do, his own credibility and standing and the prospect of conviction in the case might both be severely damaged."
After meeting at a five-star hotel in London's exclusive Mayfair district, Smith drove Contostavlos and some companions home.
He overheard a conversation in which "Tulisa had spoken about someone in her family being dependent on cocaine" and was "negative" about the drug, she added.
At the original trial, which collapsed, the pop star was alleged to have arranged to supply Mahmood with cocaine after that.
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