Shania Twain is pulling back the curtain on what's kept her marriage to Frédéric Thiébaud strong for the past 15 years. "He's really good at reminding both of us that we have to keep communication open," Twain told People. Read More: Shania Twain Says Trying to Stay Thin Left Her Malnourished"If you have a man that is really open and wants to keep the communication open, you're blessed as a woman," she added. Read More: Shania Twain's Album 'Little Miss Twain' Pays Tribute to Her MomDespite their different approaches, Twain said keeping the lines of communication open has helped their relationship thrive. Get our free mobile appAfter 15 years together, Twain said keeping the lines of communication open remains the foundation of their marriage.