Former X Factor judge Tulisa Contostavlos has vowed to launch an appeal against her conviction for assaulting a celebrity blogger at a music festival.

The N-Dubz star was found guilty of hitting Savvas Morgan at V-Festival in Essex in August last year.

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The ruling was made by a judge at Stratford Magistrates' Court yesterday.

Contostavlos was ordered to pay a total of £3,020, including of a £2,700 contribution towards the cost of the prosecution.

Earlier this week a drugs trial against Contostavlos collapsed at Southwark Crown Court after the judge said there were "strong grounds" to believe undercover reporter Mazher Mahmood - known as the fake sheikh - had lied in the witness box.