Sophie, from Skegness, who turns 40 on Tuesday, praised the nimble ex-hunter's sure-footedness on the stretches of Tarmacadam that interrupt the four-and-a-quarter mile course in the Yorkshire Wolds, near Market Weighton.
Temporary traffic lights stop the traffic allowing the 22-strong field to hurtle over the busy A164 close to the finishing post.
Sophie adds her footnote to an incredible piece of living history - a history that has played out every year since 1519 when the race began as a way for the "Squires to see who had the best horse".
King Henry VIII was on the throne when it began and in the more than 500 years since then there have been 22 monarchs and 58 Prime Ministers.
Here are the best pictures from the event.

5. Kiplingcotes Derby
A good crowd attended the race which is held on the Yorkshire Wolds. Photo: Jonathan Gawthorpe


7. Kiplingcotes Derby
Sophie Faulkner-Smith shows her delight after claiming first place. Photo: Jonathan Gawthorpe

8. Kiplingcotes Derby
The weigh-in for the 507th Kiplingcotes Derby. Photo: Jonathan Gawthorpe


