Katie Hannaford, 36, was left more than a little red-faced when she suffered the fall last week (15 June), flashing teachers, parents and students alike while partaking in the school event.
Apparently, her eight-year-old daughter convinced her to do the run as she was desperate for her mum to take part, although she's probably regretting the decision now.
In the hilarious video, the mum from Basildon in Essex lines up in the third lane from the left as the crowd cheers the participants on.
Source: LADBible
Photo: Getty Images