Report: Shania Twain Considered 'Other Woman' a Close Friend

The reported "other woman" in Shania Twain's separation from her husband was a close friend of the singer's, sources told People magazine.

"Their two families would vacation and spend holidays together," one source said. "Shania considered Marie-Anne one of her best friends."

Music producer Robert "Mutt" Lange's relationship with Marie-Anne Thiébaud, 37, a longtime secretary and house manager at Twain and Lange's estate in Switzerland, was behind the breakup, several sources familiar with the situation told People.

Click here to read more in People and to see a photo of Marie-Anne

"Mutt and Marie-Anne left their spouses for each other and are still in a relationship," said one source, adding that the Swiss employee was a fixture in the household Twain, 42, and Lange, 59, shared with their son, 6-year-old Eja D’Angelo.

After the separation was announced, Lange told People that an affair was "absolutely not the reason [for the breakup]... It's literally just a growing apart, that's all." He also denied that he was in a relationship with Thiébaud, saying, "It's not true."

Whatever the reason, Twain "is devastated," a source told People. "This came out of left field."

Twain, who married Lange in 1993, is best known for her hits "Man! I Feel Like A Woman!" and "You're Still the One." Lange produced three of Twain's albums: 1995's "The Woman in Me," 1997's "Come on Over" and 2002's "Up!"