Months after reports surfaced that X Factor judge Tulisa Contostavlos became the latest celebrity to be hit by a sex tape scandal, an explicit tape has been leaked online.

The seven-minute clip featured on allegedly shows the 23-year-old singer engaging in sexual act, reportedly recorded on a BlackBerry handset before she got her big X Factor break.

Tulisa was targeted by unnamed man in August last year who was trying to sell the tape for £500,000.

The N-Dubz singer was reportedly sickened by the man's attempt to cash in on her new television popularity with the 'fake' sex film of her.

A spokesman for the star said at the time: "This tape is 100 per cent fake and is just someone trying to cash in on her X Factor role. Tulisa has categorically never allowed anyone to film her having sex

"She is horrified that someone would go to the extreme lengths of fabricating a video. It is absolutely not her."

A spokeswoman for the singer told the IB Times UK "no comment what so ever" when asked about the video.

The highly explicit footage, which was released on a site which sarcastically states that it is not Tulisa, also claims that the man in the video is a former boyfriend.

Tulisa recently hit headlines when she was forced to admit that the reason that her suitcase "shivered" at a Miami airport was because she had a vibrating dildo inside.

The Tulisa Contostavlos 'Sex Tape': Fans React