Tulisa Contostavlos punched the air with delight and hugged supporters after her trial was thrown out at Southwark Crown Court.
The former X Factor judge had been accused of brokering a cocaine deal with an undercover reporter, a charge she strongly denied throughout.
The judge threw out the case after deciding there were "strong grounds" to believe that the undercover reporter Mazher Mahmood had "lied" at a pre-trial hearing.
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Accused Darren Osborne was a "ticking time-bomb" who had become "obsessed" with Muslims in the weeks before the incident, a court has heard.
Ukip's ruling committee unanimously backed a vote of no confidence in Mr Bolton on Sunday and six key party figures have also resigned.
A much improved day across the UK. Rain spreads in through this evening and overnight with the heaviest bursts across western Scotland.