Tulisa Contostavlos has admitted that she is the person in the sex tape she has previously asserted was "100% fake".

The X Factor judge made the unexpected admission in a YouTube video posted on Twitter.

The seven-minute tape, which shows a blonde woman performing a sex act, briefly appeared online, but was removed under instruction from the star's lawyers.

However, in an online confession, Tulisa admitted that it is her in the tape. "To set the record straight", she said, "it is me and an ex-boyfriend sharing an intimate moment."

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@officialtulisa
Tulisa Contostavlos

The truth about the tape http://t.co/0mqyNNC3

March 21, 2012 10:22 pm via web Reply Retweet Favorite

Tulisa alleges that the man in the tape as "Justin Edwards, AKA Ultra".

The judge shows pictures of her ex-boyfriend, who she said she was dating from the age of 17.

"I loved him deeply," she said, however admitted that the tape's emergence was "not unexpected".

"As you can imagine I'm devastated," she said. "When you share an intimate moment with someone you care about, you love, you trust, you don't think that moment will be shared with the rest of the UK."

"It's out there now, there's nothing I can do about it, but I had to deal with it."

Tulisa ends the tape by apologising to anyone that the tape "has offended".

Soon after the posting, "Justin Edwards", "ULTRA" and "#StopUltra2012" were all trending on the micro-blogging site.

An hour after the confession went public, Edwards posted the following on his Twitter account:

@officialultra
OfficialULTRA

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.

March 21, 2012 11:55 pm via Twitter for iPhone Reply Retweet Favorite

He later follwed it up the next day saying: "To find the truth both sides of the story should be heard b4 passing judgement #thatisall"

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> IN PICS: TULISA'S AMERICAN ADVENTURE

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• Tulisa's US Adventure

  Tulisa arrived in LA at the beginning of February to record her debut album (Pic: WENN)

• Tulisa's US Adventure

  And only a few days in to her trip, she was doing a Katie Price and getting her hair seen to by top US stylists (Pic: WENN)

• Tulisa's US Adventure

  Getting her extennos sorted. (Pic: WENN)

• Tulisa's US Adventure

  In between recording sessions there was enough time to hit the town. (Pic: WENN)

• Tulisa's US Adventure

  Tulisa was all smiles on the trip despite her recent love split from boyfriend Fazer. (Pic: WENN)

• Tulisa's US Adventure

  But she batted off the attention of admirers at a pre-Grammys party. (Pic: WENN)

• Tulisa's US Adventure

  On her way out of the studio. (Pic: WENN)

• Tulisa's US Adventure

  Tulisa's style offensive was also much talked about as she showed off a stylish American wardrobe. (Pic: WENN)

• Tulisa's US Adventure

  Tulisa is so LA now she wears sunnies in the dark. (Pic: WENN)

• Tulisa's US Adventure

  On Valentine's Day Tulisa headed straight out on the town after leaving the studio. (Pic: WENN)

• Tulisa's US Adventure

  Partying with pals, it was a case of Fazer who? (Pic: Twitter)

• Tulisa's US Adventure

  Never far from her side was her PA and best mate Gareth Varey who also had a tattoo of her name done in his leg during their trip. (Pic: WENN)

• Tulisa's US Adventure

  (Pic: WENN)

• Tulisa's US Adventure

  (Pic: Splash)

• Tulisa's US Adventure

  And bumped into former <em>TOWIE</em> star Mark Wright. (Pic: Twitter)

• Tulisa's US Adventure

  With debut single <em>We Are Young</em> in the can, it was time to film the video. (Pic: Splash)

• Tulisa's US Adventure

  That's a lot of luggage there dear! (Pic: Splash)

• Tulisa's US Adventure

  Getting cheeky on the shoot. (Pic: Splash)

• Tulisa's US Adventure

  And of course Gareth had to get in on the action in the video as Tulisa showed off her curves in a swimsuit. (Pic: WENN)