Her daughters may go from guy to guy, but Kathy Hilton has been with her husband, Rick Hilton, since she was 15. The couple celebrated their 28th wedding anniversary on Nov. 24.

So what’s the secret to such longevity? In addition to hard work, respect and date nights a couple times a week, Kathy tells OK! it’s vital not to take one another for granted.

“Never get too, too comfortable, I believe,” the socialite tells OK! at the Hollywood Bag Ladies Luncheon to Benefit Lupus Research. “And be a little mysterious, unpredictable in a sense. You don’t want to wear your hair the same way all the time. Always keep things fresh and fun.”

Perhaps she’s sharing this advice with Nicky as well. The 24-year-old designer is dating David Katzenberg, son of DreamWorks CEO Jeffrey, and Kathy, 48, approves of her daughter’s pick.

“He’s a very nice boy,” she says. “I like the fact that they have respect for one another. His parents have done a fine job. They are just the nicest family. He’s a good boy.”

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