Jiggling Jenneke's Top Gear stunt probed

Athletics Australia CEO Dallas O'Brien has sought answers from hurdler Michelle Jenneke after she missed a high-profile Sydney track meet through injury - only to race against a Top Gear sports car the next day.

The glamorous 19-year-old was billed as a star attraction of the Sydney Track Classic at Olympic Park, having shot to worldwide fame with her sexy pre-race routine and an appearance on Sport's Illustrated's 2013 swimwear calendar.

But she pulled out just before Saturday's race, citing a hamstring injury. Eyebrows were then raised as Jenneke appeared at the Top Gear Festival at Sydney Motorsport Park on Sunday - and ran against a high-powered Nissan GT-R driven by presenter Jeremy Clarkson.

Footage of the race emerged on social media sites, including YouTube and Facebook.