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Inside Shania Twain’s Marriage

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A country superstar’s marriage collapsed at the hands of her best friend, and the man left standing in the wreckage became her second husband.

Shania Twain built one of the best-selling catalogs in country music history alongside producer Robert “Mutt” Lange, only to watch their 14-year marriage implode when Lange had an affair with the woman Twain trusted most. What happened next reads less like a scandal and more like a rescue — and it’s the subject of Nicki Swift’s Inside Shania Twain’s Marriage.

• Shania Twain married producer Robert “Mutt” Lange in 1993; the couple had a son, Eja, in 2001, and settled in Switzerland where they hired Marie-Anne Thiébaud as an assistant and estate manager.
• In 2008, Lange asked for a divorce citing the couple growing apart — but Marie-Anne’s husband, Frédéric Thiébaud, personally told Twain that Lange and Marie-Anne were having an affair.
• Twain and Frédéric married on New Year’s Day in 2011 in Rincon, Puerto Rico, after getting engaged in December 2010 with a reported $100,000 ring.

The Betrayal Behind the Divorce

Twain and Lange’s marriage looked bulletproof from the outside — 14 years together, a catalog of hits Lange helped produce, and a son, Eja, born in 2001. The cracks became public in 2008, when Lange told Twain he wanted out, framing it as a couple simply growing apart. That explanation didn’t hold. The person who actually broke the real story to Twain was Frédéric Thiébaud, whose own wife, Marie-Anne — the Twains’ hired estate manager in Switzerland and, by then, Twain’s close friend — was the woman Lange had been seeing.

The dual betrayal meant Twain wasn’t just losing a husband; she was losing the friend she’d trusted with her household and her privacy. Frédéric was in the same position, blindsided by his own wife’s affair with the man he’d known through the Twains’ orbit in Switzerland.

Two Marriages Fall Apart at Once

With both of their marriages collapsing over the same affair, Twain and Frédéric turned to each other — first through phone calls and emails, then in person, as they compared notes on a situation neither of them had seen coming. That shared wreckage became the foundation of something else. By 2009, the friendship had shifted into romance, a development Twain would later describe in her 2011 memoir From This Moment On and in her docuseries Why Not? With Shania Twain as unexpected but ultimately right.

Twain described the whole ordeal as “twisted, but so beautifully twisted.”

It’s the kind of line that only makes sense once you know the full sequence — the affair, the parallel divorces, and the two people left outside the betrayal finding each other because of it. Stories like this tend to follow a familiar arc in entertainment coverage, the same one that runs through pieces on celebrities whose friendships curdled into rivalries, except here the friendship-turned-heartbreak produced a second marriage instead of a feud.

The Proposal and the Wedding

Frédéric proposed in December 2010, writing “I love you” in the Swiss snow before presenting Twain with a ring reported to be worth $100,000. The couple didn’t wait long to make it official: they married on New Year’s Day in 2011, in a ceremony in Rincon, Puerto Rico. Meanwhile, Lange and Marie-Anne stayed together, meaning all four people involved in the original betrayal ended up paired off with each other’s former spouses.

Twain has been candid about how much Frédéric’s support mattered during the worst of it, crediting him with helping her get back to writing music after a stretch where the heartbreak left her unable to work at all. That kind of account — a public figure walking back through a personal collapse in detail — sits alongside other entertainment deep-dives like Inside Megan Fox’s Relationship History, where the public timeline only tells part of the story until the person involved fills in the rest.

By the time Twain sat down to tell the story herself, in the memoir and later on camera for Why Not?, she wasn’t framing it as a scandal anymore — she was framing it as the moment Frédéric Thiébaud stopped being a bystander in someone else’s marriage and became the person she built her second one with.