"Hilary Duff and husband Mike Comrie have mutually decided [on] an amicable separation," her rep said Friday in a statement (via E!). "They remain best friends and will continue to be in each other's lives. They are dedicated to loving and parenting their amazing son, and ask for privacy at this time."
Duff addressed the parting of ways on Twitter and reiterated that she and Comrie remain close.
"Mike and I are sitting here, we are so appreciative for all of your kindness & well wishes," she tweeted. "Not an easy day but we're getting thru it together."
A Duff source tells People that "there was no major incident -- no big event between the two of them. They really did drift apart. They have put effort and thought into this decision for a long time. They tried couples therapy, but in the end, they realized at this time, they work better as friends. And they really are great friends."