But it didn't go quite as smoothly as she'd have liked... the stunning Hollywood A-lister had to be rescued by the show's mystery helmet-wearing racing driver when the car's gearbox conked out mid-lap.
Both Cameron and Tom Cruise - her co-star in new movie Knight And Day - took part in the "Star In A Reasonably Priced Car" slot.
An excited insider on the hit show, presented by Jeremy Clarkson, Richard Hammond and James May, said: "She looked flustered and clearly her time behind the wheel didn't go exactly according to plan."