Mary-Kate Olsen Adds Horseback Riding to Her Resume - See Her Competition Pics!

Mary-Kate Olsen rides her horse while competing in the Hampton Classic Horse Show on Thursday (August 28) in New York City.

The 28-year-old fashion designer may possibly have the horse with the coolest name – Swagger!

PHOTOS: Check out the latest pics of Mary-Kate Olsen

While relaxing on the sidelines, MK showed off her large engagement ring from fiance Olivier Sarkozy.

Mary-Kate‘s twin sister Ashley Olsen is also in the Hamptons this week and they have been spotted roaming around town on several occasions over the last few days.