Tulisa is currently suing her ex boyfriend for leaking the tape at the High Court, seeking £100,000 in damages for breach of privacy and confidence.
Tulisa this week submitted an eight page witness statement giving her side of events, where she claims that she has been left "ill by humiliation" after the six minute clip was posted online.
“I believe I must have been intoxicated at the time the video footage was taken," Tulisa says in the statement, The Sun reports.
She explains: “I must have been very drunk to let my then boyfriend Justin Edwards, who I also know features in the video, take the footage.
“Justin Edwards claims in a letter to his solicitors that I ‘took many pictures and videos of us having sex’ and I still have those videos. That is completely untrue.”
Turning on her ex, Tulisa goes on: “I believe Justin Edwards is a manipulating and bitter man. He has a jealous vendetta against me. This video is part of a plan to damage my life and career.
“The impact on my health has been severe. My concern is to stop further publication of the video.”
And the star even makes mention of Simon Cowell in the statement, saying: “I have read in The Sun that I am being backed by Simon Cowell, which is a great encouragement.”
An emergency injunction banning the tape is still in place, with a trial date set for this summer for Tulisa's lawsuit against her ex.