The 42-year-old fashion designer - whose six-year-marriage to Jude ended in divorce in 2003 - insists there are no hard feelings between the pair and they are looking forward to a family Christmas with their children.
Sadie said, "Ultimately, neither of us is bitter. We started out as friends, we have wonderful children and we are still friends. We talk every single day on the phone and care about each other being happy.
"We're all genuinely looking forward to having a happy Christmas together and it's that simple. At the end of the day it's all about families. Jude and I will always be family."
Sadie and Jude have three children, 11-year-old Rafferty, seven-year-old Iris and five-year-old Rudy.
Sadie also revealed she was recently able to use her trapeze skills - which she took up as a way to keep in shape - in her new movie ‘Beyond The Rave'.
She added, "I play a vampire who does a stunt on a flying trapeze. Obviously I did it myself. I had to fly from the trapeze and drop 150ft while keeping a completely fixed look on my face. It was pretty terrifying but I loved it."