A woman suing Usher for exposing her to herpes claims she has a sex tape of them.

Quantasia Sharpton is one of three people to be taking legal action against the 'OMG' singer and though he has previously denied sleeping with the 21-year-old student, the alleged victim insists she has proof of their encounter on camera.

And Quantasia told YouTube vlogger Miss Jacob Kohinoor Usher knew he was being recorded during their alleged liaison in November 2014.

She also said her lawyer, Lisa Bloom, plans to subpoena hotel surveillance footage that shows the 'Yeah!' hitmaker going into her room after a former employee at the Days Inn in Atlantic City previously told TMZ she had seen the singer walk into the lobby of the building before Quantasia took him to her room.

Usher has denied the woman's claims against him, reportedly insisting Quantasia wasn't ''his type'' and at the time of the alleged encounter, he was smitten with his now-wife Grace Miguel, who was then his manager, and they were spending all their free time together.

Quantasia - who does not have herpes - recently claimed she took action against the 'Confessions' singer for not disclosing that he allegedly had the infection because she felt her ''rights were violated''.

She said: ''I had a child a year ago, and I knew I was negative. But I contacted [lawyer] Lisa Bloom to find out what my rights are as a woman.

''Although I am negative, I am upset by the reports because I never would have consented, if I would have known. I would not have taken a risk of getting an incurable disease.

''My health is very important to me, now that I am a mother. I feel that my rights were violated.

''I am speaking out today on behalf of myself and others, some of whom are positive and are embarrassed to speak out publicly. I am doing this so that he does not do this to anyone else.''

And the woman urged Usher to speak out and confirm whether or not he has the condition.

She added: ''Usher, if you are negative, please say so. If you are positive, you need to warn your sex partners, so that they can make their own informed decisions.''