Kate Hudson's "life-force" is her mother Goldie Hawn.
The 'Almost Famous' actress - who has sons Ryder, 11, with ex-husband Chris Robinson, and Bingham, four, with former fiance Matt Bellamy - says her mom is her biggest inspiration and means everything to their family.
She said: "As much as she means to other people for other reasons, she is literally the life-force for me and my family."
The 36-year-old beauty is preparing for the release of her new lifestyle book, 'Pretty Happy: Healthy Ways to Love Your Body' - in which she shares how she became "healthy, strong and beautiful from the inside out - and hopes the guide provides her fans with "inspiration and motivation" to lead a better life.
She told People magazine: "One thing everyone I know is trying to accomplish is balance.
"This book is about being as mindful as possible when it comes to your well-being, but still enjoying your life. I hope it provides some inspiration and motivation for making a shift in our lifestyles for the better."
Kate's philosophy in the book is about "simplicity, accessibility, positivity and throwing the idea of 'perfection' out the window."
She explained: "I learned a long time ago that trends and fads come and go and are not a long-term solution.
"We all have to find what works best for us and allows us to be our own best version of ourselves."