Photos via: Just Jared
Mary-Kate cools off at the 39th Annual Hamptons Classic Horse Show, displaying her beautiful engagement ring! She wore an off-white blouse, riding pants and black knee-high boots.
+ Marc Jacobs Metal Aviator Sunglasses
+ Ivanka Trump Utility Crepe Blouse In Ivory
+ Violeta By Mango Bicolor Structured Blazer
+ Ralph Lauren Palermo Hudson Twill Pants
+ Tory Birch Teresa Black Riding Boot