Girls Aloud star Nicola Roberts reportedly crashed into a motorcyclist and branded him a "f*****g idiot" for denting her Porsche Cayenne.
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Jason Giles, 21, claims that the singer sent him flying into the air before launching the foul-mouthed rant in a June 14 incident in Twickenham, south-west London.
The gardener was left in the middle of the road after the 31-year-old allegedly swerved left into the 'no entry' road and crashed into him.
She allegedly shouted: "What the f*** did you do that for? Look what you've done to my Porsche!"
Speaking to the Sun, Giles said: "If a bus had been coming the other way I'd be dead. But she didn't seem to care about me.
"Her only concern was her car."
Giles was lucky to escape with only cuts and bruises but his £850 bike was written off.
According to the Daily Mail, Nicola allegedly refused to hand over her insurance details after the crash but finally agreed when Giles' girlfriend arrived on the scene and persuaded her.
"The claims that she swore at the other driver are false."