An alleged sex tape of singer Tulisa Contostavlos has leaked on the Web, sending Twitter into a frenzy and the X Factor judge has since threatened legal action. The tape can be seen through a link here.

The seven-minute sex clip reportedly features a blonde-haired woman who resembles Contostavlos engaging in oral sex with an unidentified man. The website nowwatchtvlive has photos.

The Daily Mail reported that the woman in the video looked like the 23-year-old N-Dubz singer during her days before the X Factor makeover.

The sex tape was allegedly filmed backstage at a gig, Contact Music reported, quoting the website, which featured the video.

The BBC reported that an online magazine also claimed that Contostavlos' lawyers have forced them to take down a link to the alleged sex tape. The magazine reportedly got a link to the sex tape after became a popular trending Twitter.

Nadia Kavahita, co-owner and editor of Pappzd magazine, told the BBC that the staff were shocked when the lawyers came to their office.

We were given a deadline in which to take it down otherwise there would be further action, Kavahita said. We had no choice but to take it down.

The Daily Mail reported that Simon Jones, a rep for the singer, has said that Tulisa has asked us not to comment on speculation about her personal life.

The BBC has reported that Contostavlos has denied being involved in a sex tape in the past.

Twitter is still talking about the sex tape. Many noting that pronouncing the singer's name is well, quite a mouthful.

Tulisa's surname is Contostavlos, which, ironically, is a bit of a mouthful, wrote Ash Warner.

Others couldn't help but make silly puns off the video.

Tulisa Contostavlos is unlikely to be returning as a judge on the X Factor, wrote Thomas Barber. Sources have said that 'She's blown it.'

Related Article: Tulisa Contostavlos Sex Tape Still Online After 'X Factor' Judge's Lawyers Took Action