X Factor judge Tulisa Contostavlos has accused an ex-boyfriend of betraying her by putting a sex tape showing the pair in "an intimate moment" on the internet.
The singer posted a video on YouTube in which she said she had "confronted" Justin Edwards, who performs as MC Ultra.
She said: "This is someone that I loved, that I trusted, that meant the world to me, that I feel deeply betrayed by. I am sure that everyone at home has had intimate moments with someone they cared about and never expected at any point that they would go and share it with the rest of the world."
Contostavlos said they got together when she was 17 and the couple "practically" moved in together for a while.
She also showed several photographs of the pair together including one of them on holiday.
The former N-Dubz star said: "I loved him deeply, had a lot of respect for him, we talked about kids, we talked about marriage."
She said the emergence of the footage was not "unexpected" and that mutual friends had warned her it could surface online.
She said: "I confronted him on this situation, he lied about it, he completely denied it and here we are today and the footage is now circulating online."
She accused Edwards of "sitting in silence, pretending it's not him on the tape when it is".
Edwards has not commented directly but tweeted: "I believe in silence being a sign of Integrity but in this case I guess I'll have to speak up and Lay out the facts and let you guys decide."
He added: "To find the truth both sides of the story should be heard b4 passing judgment #thatisall."
Contostavlos shot to fame as a member of N-Dubz, with her cousin Dappy and ex-boyfriend Fazer in 2000.
She made her debut as an X Factor judge last year and mentored the winning act Little Mix.