Tulisa has been found guilty of attacking a celebrity blogger at V-Festival in Chelmsford, Essex.
The N Dubz singer was accused of hitting blogger Vas Morgan, who currently stars in The Only Way Is Essex, when she was drunk.
She was found guilty by a judge at Stratford Magistrates’ Court in east London. Her assistant, Gareth Varey, was cleared of threatening behaviour.
Earlier this week, the drugs trial against Contostavlos collapsed at Southwark Crown Court after the judge said there were “strong grounds” to believe that undercover reporter Mazher Mahmood – known as the Fake Sheikh – had lied in the witness box.
Tulisa has been fined £200 and ordered to pay a £20 victim surcharge, £100 compensation and £2,700 costs.