The story was broken just a few hours ago and many Latics fans are shocked to see another face leaving with just Mike Pollitt coming in so far.
Eaden said "I enjoyed myself at Wigan. We've had nothing but success over the past three years or so but the blow of leaving them is cushioned by the fact that I've joined a club like Forest."
"I went back to Wigan, told Paul Jewell I wanted to come and I'm grateful to him for helping make it possible."
Meanwhile, the Latics have lost out on 18 year old Colin Kazim-Richards who has chosen Brighton over Paul Jewell's side.
He has joined the Seagulls from Bury.