Speaking about for the first time last night, Tulisa uploaded a video to her official YouTube channel to put her side of the story across.
The clip, which began to circulate on the net on Monday, sees Tulisa performing oral sex on another man, which Tulisa claims is ex-boyfriend Justin Edwards, also known as rapper Ultra.
Opening up about the video, Tulisa said: "I am devastated and heartbroken. I've been in bits for the last few days."
She went on to explain: "When you share in intimate moment with someone you love and care about and trust, you never imagine that that shortage will at any point be shared with the rest of the UK or the rest of the world.
"It’s a pretty tough time for me, but I don’t feel I should be the one who should take the heat for it. It’s something he took upon himself to put the footage online and he's now sitting in silence saying it’s not him on the video when it isn't."
Clearly annoyed and upset, the 23-year-old continued: "This was someone that I loved; I trusted and that meant the world to me that deeply betrayed me."
The video was touted to newspapers last year, so the N-Dubz singer admits she was "expecting" it to come out eventually, and wasn't going to pretend it didn't happen.
She added: "This is out now and I understand there’s nothing I can do but I do feel like I need to share my side of the story."