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Kathy Hilton and husband Rick Hilton celebrated their latest milestone anniversary with a little European getaway!

In an exclusive interview with PEOPLE at Saratoga Spring Water’s special event at Design Miami on Monday, Dec. 2, the Real Housewives of Beverly Hills star, 65, said she and Rick, 69, toasted 45 years of marriage with a trip to London and Paris. The day after Kathy hosted her annual holiday pajama party at her Los Angeles home, the pair flew overseas.

"We did five days in Paris and seven days in London," notes Kathy, who wore the newly-named Saratoga Signature Blue to the event. Pantone adopted the name to replace cobalt blue.

Making their visit to the City of Light extra magical, it snowed. "It was shocking, it was gorgeous. My husband put it on his Instagram," she says of the wintry weather.

Kathy Hilton at Saratoga Spring Water’s special holiday dinner prepared by Chef Curtis Stone on Dec. 2, 2024 in Miami.

Sergi Alexander/Getty 

Kathy Hilton and Husband Rick Go to the Cheesecake Factory Once a Week for Date Night

Since they were away over Thanksgiving, the couple enjoyed a holiday meal — with "turkey and all the trimmings" — while in London. On their flight home on Dec. 1, they were treated to a Christmas dinner on the plane, complete with one of Kathy's favorite appetizers.

"One thing I do love, and it’s always at all my parties all through the years, are pigs in a blanket and I didn’t realize the Brits — that’s part of their Christmas dinner. So I got another pig in a blanket [on the plane]," she tells PEOPLE.

Kathy and Rick Hilton attend the Carousel of Hope Ball in Los Angeles on Oct. 5, 2024.

Amy Sussman/Getty

Reflecting on her decades-long marriage to her real-estate mogul husband, the reality star says the secret to their relationship is that they are "best friends."

"And, I was just saying to someone, getting married so young like that — I was 19 and he was 23 — [the key is] just keeping the right people around you, the right influences and being around other couples who are happy [and] have the same values as you," she adds.

Kathy and the Hilton & Hyland co-founder tied the knot on Nov. 24, 1979. They went on to welcome four children together: Paris, 43, Nicky, 41, Barron, 35, and Conrad, 30.

Last month, Kathy shared another detail that has helped keep the couple's marriage strong, telling PEOPLE, "We have not been away from each other for two weeks in [all our years] of marriage."

“I don't think you go to bed without saying, ‘I love you,’ and giving each other a kiss and never in a fight or anything,” she added. “If you have had a disagreement, you always make up before you go to sleep and keep a little mystery and always keep it exciting and fun.”

The two also stay connected with a weekly date night — and it's surprisingly low-key. Back in January, Kathy revealed that she and Rick have dinner at the Cheesecake Factory "once a week."

“All their food is good," she told Page Six of the popular restaurant chain. “Actually, you walk in there, and there are people. We love that! We don’t want to sit in a restaurant with nobody in the room."

Kathy and Richard Hilton's Sweetest Moments with Their Grandkids

Kathy and Rick Hilton in March 2023.

Rodin Eckenroth/WireImage

With Christmas approaching, Kathy and Rick are looking forward to having their whole family together, including their eight grandchildren. The reality star told PEOPLE at Monday's event in Miami — where she wore a stylish look in Saratoga's signature cobalt blue, which Pantone has officially named Saratoga Signature Blue: Color 286 C — that she has already dropped a hint to Rick about what she is hoping to find under the tree from him this year.

"There is a very pretty crystal inkwell and it’s antique and I’d love to have it. So I put that out there to my husband, so we’ll see," she says.

At the Saratoga event, which served as the kickoff of the second year of the Saratoga Supper Club, Kathy and other attendees enjoyed a five-course dinner prepared by Michelin-starred chef Curtis Stone. The dinner began with "an ode" to the color blue via an opening dish consisting of striped bass tartare covered with blue borage flowers. Saratoga’s Supper club events will be held in Miami on Dec. 4, Boston on Dec. 12, One White Street on Jan. 8, Chicago on Jan. 22, and Los Angeles on Jan. 30.

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The Real Housewives of Beverly Hills airs Tuesdays at 8 p.m. ET/PT on Bravo, and can be streamed the next day on Peacock.