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Mary-Kate Olsen

John Roca/PacificCoastNews

Mary-Kate Olsen is saddling up!

The 28-year-old former child star, Full House alum and multi-million-dollar fashion empire co-owner is taking part in the 2014 Hampton Classic Horse Show in Bridgehampton, N.Y., which began last Sunday and is set to end Aug. 31.

Wearing a chic black blazer, tan riding pants and black riding boots, Mary-Kate participated in two recent rounds of the prestigious equestrian competition. During one, she rode a white mount named Swagger (pictured above, wearing an ear bonnet, often used to protect the animal from flying insects).

She also competed while riding a chestnut-colored horse named Uniek, who at one point refused to jump, resulting in no score, results showed.

Mary-Kate, sister of twin, frequent co-star and business partner Ashley Olsen and 25-year-old actress Elizabeth Olsen, has been riding for years.

At last year's Hampton Classic Horse Show, another rider rode one of her own horses, a black mount named Marvelous, and she watched the competition with beau Olivier Sarkozy.