Ally Hilfiger has got engaged.

The 31-year-old daughter of the fashion mogul Tommy Hilfiger is to tie the knot with her longtime boyfriend Steve Hash and they plan on getting hitched at their family's house in Connecticut.

Steve proposed while the couple were in Paris in July with a ring he designed himself and the brunette beauty has described how ''surprised'' she was.

Talking about the adorable proposal, she told People: ''I was so surprised and overwhelmed with happiness and excitement.

''We are having fun planning a lovely wedding at our family's home in Connecticut.''

The couple have been together for nearly six years and have 17-month-old daughter Harley together.

The engagement comes at an already busy time for the former 'Rich Girls' star as she has recently released her first book, 'Bite Me', about her struggles with Lyme disease.

Ally contracted Lymes when she was just seven from a tick bite and spent years being misdiagnosed and saw around 10 different doctors.

Ally said after being diagnosed her condition is much more manageable and her improved health meant she was able to have a child with Steve.

She previously shared: ''I wasn't planning on having a baby so soon. I didn't even think I could get pregnant! And then I did, and I was a little freaked out, but I was reassured by several doctors that I was strong enough and could handle it. And I felt in my heart that I was.

''My baby is perfectly healthy and normal but I am sure if I had had her 11 years ago, it would not have worked out. I don't believe I would have had a healthy pregnancy or a healthy child at that time because I was so sick.''