Music mogul Robert 'Mutt' Lange has spoken out about his split from country star Shania Twain, revealing the couple was "growing apart".

 Lange has filed for divorce from the singer after 15 years of marriage, and in a brief statement, the music producer admits the separation is "unfortunate."

 He tells People magazine, "It's just an unfortunate thing that's happened... It's literally just a growing apart, that's all."

 Reports suggest the split was as much of a shock to Twain as it was for her fans.

 A source says, "She's devastated. She's getting through it with a very close-knit group of family and friends."

 The couple wed in 2003. They have a six-year-old son, called Eja D'angelo.