Tommy Hilfiger's daughter is engaged to Steve Hash

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Credit: Courtesy Ally Hilfiger

Ally Hilfiger is going to be one stylish bride!

The daughter of designer Tommy Hilfiger is engaged to longtime boyfriend Steve Hash.

Hash popped the question to Hilfiger in July with a ring he designed himself during a trip to Paris. The couple, who have been together for nearly six years, are parents to daughter Harley, 17 months.

“I was so surprised and overwhelmed with happiness and excitement,” Hilfiger, 31, tells PEOPLE. “We are having fun planning a lovely wedding at our family’s home in Connecticut.”

It’s a busy time for the bride-to-be, who just released her first book Bite Me, which chronicles her harrowing experience with Lyme disease.

“It’s very difficult to struggle in the public eye with Lyme disease because it’s a very complicated disease,” Hilfiger previously told PEOPLE. “You can really look great and be on one day and feel fine and happy and then the next day or five days or month and you can’t get out of bed. It’s crazy.”

Hilfiger’s book is available now online and wherever books are sold.