Lady Kitty Spencer is heading down the aisle.

The model, 29, who is the late Princess Diana’s niece, is engaged to her much older boyfriend, Michael Lewis, 60. The pair have been together for over a year.

According to the Daily Mail, Lewis popped the question right before the Christmas holidays.

RELATED: Lady Kitty Spencer Is The Dream Dinner Party Guest For Town & Country

Last summer, the couple made their romance public when they took a trip to the Hamptons together.

Lewis, who is five years older than Spencer’s father, Earl Charles Spencer, is a South African-born English businessman. He currently serves as chairman for the South African retailer Foschini.

Spencer isn’t the only royal-connected family member to get engaged in the past few months, Kate Middleton’s younger brother James recently announced his engagement to longtime girlfriend, Alizee Thevenet.

RELATED: Lady Kitty Spencer Steps Out With 60-Year-Old Millionaire Boyfriend

Congratulations to the happy couple!

Click to View Gallery
The Royals: Official Family Portraits