Kate Hudson has said relationships are "the most challenging things".

The actress, who became engaged to Muse frontman Matt Bellamy in 2011, said that being in a relationship is "where you do the most work in your life".

She revealed in an interview with Self magazine: "You come face-to-face with yourself, and if you can deal with realizing we're all flawed, accept it and work with it, you might have a really amazing, lasting relationship." 

Hudson also opened up about her famous parents, Goldie Hawn and Kurt Russell, saying: "If I look at my parents, who've been together 30-something years, I'd say no matter what they've been through, they share similar values and really like each other. It sounds easy, but it's not."

"My mum once said something so poignant to me: 'Honour your female friendships, because men can come and go, but when we nurture our relationships with women, they can be forever'," she continued. "I really believe that. My girlfriends are so important to me. They've been my rock-solid foundation."