Guess Who?

Time to play a little game of guess who!

Now you get to guess who this is, and riding whom:






Hint time!
1. All of these pics were taken at the Puissance, on October 10, 2009.
2. The horse is a 1997 grey mare
3. The horse's stable name is Dina
4. The rider is one of my favorites, featured on this blog a little while ago

And just as a very, very, VERY last resort, you can go to this website to find out who the horse and rider are! Ready set go!