The celebrity cheater: Robert "Mutt" Lange, the Svengali-like music producer behind Shania Twain's hits.
The other woman: Twain's best friend, Marie-Anne Thiebaud, who was Lange's personal assistant and Swiss interpreter.
What was gained: A qualified happy ending. When Lange met Twain in 1993, he was a legendary rock producer (AC/DC, Bryan Adams, Def Leppard) and she was a Canadian country music novice 17 years his junior. They met, quickly married and moved to Switzerland. Together they produced three multiplatinum albums, including "Come on Over," still the best-selling album by a female singer. They also had a son, Eja, in 2001.
Twain learned of her husband's affair from the other woman's husband, Swiss businessman Frederic Thiebaud, whom she later started dating. Following her 2010 divorce from Lange, Twain wed Frederic on New Year's Day in Puerto Rico. It was Frederic who suggested she take Oprah Winfrey up on an offer to host her own reality TV show on the OWN network, "Why not? With Shania Twain."
What it cost: While terms of their Swiss divorce remain sealed, there may have been a redistribution of the Twain-Lange empire, which Celebrity Net Worth estimates at $350 million for Twain and $225 million for Lange.