The 14-year-old sister of Formula One driver Heinz-Harald Frentzen took a joyride in her mother's car while her parents were watching Monday's French Grand Prix.
Nicole-Nadine Frentzen was detained by police after she was caught driving the car with her 11-year-old sister and a 12-year-old friend as passengers, a Moenchengladbach police spokesman said.
Frentzen, who drives for Sauber, finished 12th in the French race.
Motorsport: Frentzen girls' joyride
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