The split was confirmed by a representative for the couple on December 11, reported Ace showbiz.
"Idina Menzel and Taye Diggs have jointly decided to separate at this time. Their primary focus and concern is for their son. We ask that you respect their privacy during this time," the representative said in a statement.
Diggs, 42, and Menzel met for the first time when they were in the original Broadway production of 'Rent' in 1995. They tied the knot in 2003.
Earlier this year, Menzel who played the mother of Lea Michele's character on 'Glee' had revealed about going through a tough marriage time.
"We work at it. I'm not going to glamorize it or glorify it - we go through tough times like everybody else, but we love each other very much. We try not to be away from each other for more than two weeks at a time, and we try to find new ways to communicate," she had said.