The star filed the papers in L.A. County Superior Court on Nov. 21 -- the same day she announced the separation in a blog post on parenting site Kveller.
"After much consideration and soul-searching, Michael and I have arrived at the decision to divorce due to 'Irreconcilable Differences,'" the Blossom actress, 36, wrote of the split. "Divorce is terribly sad, painful and incomprehensible for children. It is not something we have decided lightly."
"Our sons deserve parents committed to their growth and health and that's what we are focusing on. Our privacy has always been important and is even more so now, and we thank you in advance for respecting it as we negotiate this new terrain."