N-Dubz star Tulisa was pictured outside Southwark Crown Court and was dressed in a simple black skirt, camisole and monochrome jacket.
Tulisa wore her long brunette hair in a ponytail and stayed silent as she entered the building.
The former X Factor judge has been charged in connection with the supply of class A drugs, following a newspaper sting operation in June last year. Tulisa denies the charge.
The trial, which is expected to last two weeks in total, got underway this morning (16 July) with the prosecution opening.
Timothy Cray QC, prosecuting, has been outlining the case and the jury has heard Tulisa told an undercover reporter her ex boyfriend could supply him with cocaine.
Tulisa's trial had initially been due to start yesterday, however legal arguments led to it being adjourned until today.
If found guilty, Tulisa could be given a custodial sentence.
The case continues.