R. Kelly is most certainly the man involved in the sex tape with a 13-year old girl, claims the former best friend of the teen involved.

The rapper, currently on trial for allegedly participating in sexual activities with a minor, was named as the man in the footage by 24-year old Simha Jamison, who testified that she believed her friend Roshona Landfair, now 23, is the underage girl in the video. 

And when asked who she believed the man in the video tape to be, she replied, "Her Godfather, R. Kelly".

Jamison told the court she met the Grammy-winner through Landfair, who introduced the star as her "Godfather".

Jamison went on to tell the court she recognised the girl in the video as her former friend from her face and a "mullet" haircut the two girls had both sported at the time.

The witness told Cook County prosecutor Shauna Boliker she had previously seen the tape in question in February 2002.

The girl in the video, thought to be either 13 or 14 years old at the time, has maintained that she isn't the female in the footage, and Kelly's attorneys backed up her claims.

On Tuesday, Kelly's lawyers insisted the man in the video bears key physical differences from the star.

Kelly stands accused of videotaping himself having sex with a 13-year-old girl, and could face up to 15 years in prison if found guilty.

The trial continues.