Twain and Lange in London in 2000
"It's just an unfortunate thing that's happened," Lange told PEOPLE shortly after the couple's separation was announced Thursday. "It's literally just a growing apart, that's all."
A source close to Twain also tells PEOPLE that the singer didn't expect the split. "She's devastated," another source says. "She's getting through it with a very close-knit group of family and friends."
Twain, 42, and Lange, 59, married after a six-month courtship in 1993. They have a 6-year-old son, Eja D'Angelo.
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