Tulisa Contostavlos has been found guilty of assaulting celebrity blogger Savvas Morgan at the V Festival in Chelmsford, Essex, in August 2013.
Former X Factor judge Tulisa Contostavlos, 26, denied hitting Savvas Morgan.
She was ordered to pay £3,020 ($4,800), including £2,700 ($4,300) of legal costs, a £200 ($320) fine and £100 ($160) compensation.
Her assistant, Gareth Varey, was cleared of using threatening behavior.
Tulisa Contostavlos has been found guilty of assaulting celebrity blogger Savvas Morgan at the V Festival
The trial had previously heard how Savvas Morgan suffered swelling to his eye after the assault.
Savvas Morgan told the court Tulisa Contostavlos raised her fists in the air and was swinging her arms in a backstage area at the festival.
In a statement after the guilty verdict, Tulisa Contostavlos said: “This has been a rollercoaster week for me. I never wanted any of this.
“I did not assault Vas J Morgan and I am outraged at this decision. I will be appealing it.”
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Tulisa Contostavlos hit celebrity blogger Savvas Morgan in the eye during last year’s V Festival, a court has heard.
Savvas Morgan (Vas J Morgan) said his eye swelled after the alleged altercation on August 18, 2013.
Former X-Factor judge Tulisa Contostavlos, 25, denied assault by beating at Chelmsford Magistrates’ Court in Essex.
Tulisa Contostavlos hit celebrity blogger Savvas Morgan in the eye during last year’s V Festival
The former N-Dubz singer’s assistant Gareth Varey, 28, is also accused of threatening behavior, which he denied.
The court heard they were in a VIP area of the festival at its Chelmsford site when the alleged assault took place.
Prosecutor Matthew McNiff said Tulisa Contostavlos accused Savvas Morgan of stalking her and swore at him.
He added: “She saw the opportunity to hit him and hit him in the eye.”
The court also heard from Savvas Morgan, who said Tulisa Contostavlos, of Friern Barnet, north London, raised her fist in the air and was swinging her arms.
He said: “Everyone was jumping around trying to get at me, there was a lot going on.”
Tulisa Contostavlos’s arms were closest to him, the court was told.
The blogger was escorted away by security following the alleged attack.
Savvas Morgan said he was told by a guard: “There’s one of you and 15 of them and we don’t want to see you get hurt.”
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