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- Cindy Crawford said that friendship is the foundation of her marriage with Rande Gerber.
- The supermodel added that she advises her kids to consider whether their partners make good friends.
- A study has shown that being best friends with your spouse can benefit your well-being.
Cindy Crawford has a simple answer to a successful marriage: be friends.
"That's the advice I give my kids too," Crawford told Andy Cohen on Watch What Happens Live with Andy Cohen.