17/07/2014 10:15 BST | Updated 17/07/2014 10:59 BST

Tulisa Contostavlos Drugs Trial: Mazher Mahmood Denies 'Spiking' Former 'X Factor' Judge's Drink To 'Manipulate' Her

Tulisa Contostavlos was back in court on Thursday, accused of being involved with the supply of class A drugs.

On Wednesday, the jury at Southwark Crown Court heard that the former ‘X Factor’ judge helped to supply cocaine to Mazher Mahmood, dubbed the ‘fake sheikh’, an undercover reporter for The Sun on Sunday, to which she has pleaded ‘not guilty’.

Tulisa arrives at Southwark Crown Court

He in turn has been accused of “manipulating” and “misleading” Tulisa by her lawyer, after he posed as a film producer and told her he could get her a part in a fake ‘Slumdog Millionaire’-style film about a British girl from a working class background, which would co-star Leonardo DiCaprio and might have even landed the N-Dubz star an Oscar.

Giving evidence from behind a screen to protect his identity as he was questioned on Thursday, 17 July, Mahmood said that he used ‘subterfuge’ to secretly record meetings with Tulisa, claiming: “The motive here is in the public interest to expose criminality.”

When it was suggested he’d misled the star, he replied: “You can't mislead somebody into supplying cocaine.”

Tulisa’s barrister Jeremy Dein QC went on to accuse the undercover journalist, and his colleague “Nish”, of spiking the star’s drink during a meeting at London’s Metropolitan hotel as part of his “manipulation”, which he vehemently denied, branding the claims “outrageous” and “nonsense”.

It’s alleged that after “boasting” to Mahmood that she could “sort out” some cocaine for him, she contacted Mike GLC - real name Michael Coombs - who pleaded guilty on Monday to supplying 13.9g of cocaine for £860.

The trial, which began on Monday, is expected to last two weeks.

Photo gallery Tulisa through the years See Gallery