Former "The X Factor" judge Tulisa Contostavlos was convicted by a judge Friday of assaulting a blogger at a music festival. Contostavlos was ordered by a judge at Stratford Magistrates's Court to pay $5,127 after hitting Savvas Morgan at the V Festival in Essex last August.

The amount was distributed as $4,584 to pay for the cost of the prosecution, a $339 fine, $170 for Morgan's compensation and a $34 victim surcharge. Contostavlos shook her head in shock as the verdict was read, The Independent reports.

Contostavlos' assistant Gareth Varey was not convicted of threatening Morgan during the incident.

"I am quite sure to the requisite standard of proof, based on my analysis of the evidence that I have heard, that Ms. Contostavlos did strike Mr. Morgan in the face during an argument, and that that blow caused minor bruising and swelling," district judge Angus Hamilton said.

As she left the courtroom, Contostavlos appeared to mutter, "This is b*llsh*t."

Before Friday's trial, another case against the N-Dubz star in Southwark Crown Court fell apart when the judge believed there were "strong grounds" that undercover reporter Mazher Mahmood had perjured himself on the witness stand. The charges in that case alleged that Contostavlos supplied cocaine.

Outside the courtroom in London, Contostavlos made a statement defending her innocence.

"This has been a roller coaster week for me. I never wanted any of this," she said, according to Daily Mail. "I did not assault Vas J Morgan, and I am outraged at this decision. I will be appealing it."

"There are a number of high-profile witnesses who were there and know what happened. I urge them to come forward and tell the truth at the appeal. I am determined to clear my name as I have already done once this week. I repeat -- I did not assault Vas J Morgan. I am innocent."

Prosecutors argued in court that Contostavlos was upset with Morgan about remarks he had previously written about her on his blog, including comments about and a link to her sex tape. The defense argued that Morgan provoked her.

"It was clear from the evidence that Ms. Contostavlos held a grudge against Mr. Morgan," senior district crown prosecutor for the Crown Prosecution Service, Sarah Asbrey, said. "When she saw him at the festival, there was an argument between them, which resulted in her assaulting Morgan."

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