Rande Gerber reveals the secret to his 17-year marriage to Cindy Crawford

How Rande Gerber and Cindy Crawford Make Marriage Work After 17 Years

Casamigos Tequila founder Rande Gerber and supermodel Cindy Crawford have been married since 1998 -- an impressive 17 years. In the wake of Hollywood's latest big split (unfortunately we're talking about Ben Affleck and Jennifer Garner, of course), a celebrity marriage with that kind of lasting power becomes all the more impressive.

WATCH: Rande Gerber Says He Plans to 'Buy a Shotgun' As Model Daughter Kaia Gets More Famous

But Gerber says the secret is one word: friendship.

"We started as friends and we remained friends," he tells ET. "You have to just keep that friendship and fun in the relationship."

Gerber says he and Cindy -- who have two children, Presley and Kaia -- make sure to find time for one another. That includes family vacations to their house in Mexico -- a property they share with Gerber's longtime pal, George Clooney.

Gerber says both he and Clooney got lucky with their ladies, Cindy and Amal. "We're very fortunate," he says.

WATCH: George Clooney Reveals Why He Fell in Love With Amal

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