Country star Jana Kramer and her husband, retired football pro Mike Caussin, have been living their lives like an open book. Always candid about the struggles in their marriage on social media and on their popular "Whine Down" podcast, they are now revealing even more via their book "The Good Fight: Wanting to Leave, Choosing to Stay, and the Powerful Practice for Loving Faithfully."

Jana and Mike spoke with "Extra's" Jenn Lahmers all about their book, breaking news about auditioning to join the "Real Housewives" franchise.

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