Kate Hudson graces the March issue of InStyle UK.

Inside the mag, the Bride Wars babe opens up about everything from her BFF Stella McCartney to her personal style to life as a single mom.

Some highlights:

Kate on Stella’s clothes: “Stella makes clothes that are easy to wear. I find that of all the clothes I have in my closet, when I’m hurrying and want to just look nice and put something on, they are Stella’s.”

Kate on her own style: “Sometimes I feel a bit schizophrenic, like I have no idea! When I’m going somewhere and I’m tired and not thinking about it at all, what I end up wearing is what I would say my style is. I like things that are comfortable and flowy – and lots of jewellery”

Kate when asked if she had to choose between clothes or jewellery: “I’d rather die! I’d probably pick jewellery. I still sneak into my mom’s jewellery box. Mom and I share a lot, actually.”

Kate on her mom getting rid of her old seventies clothes: “I got so upset when I learnt she threw them out. I want them! She wore the most amazing clothes in the Eighties too. She had so much Azzedine Alaïa. And the shoes! I’d walk into her closet and she’d have every colour of pumps imaginable. I remember my favourites were magenta and turquoise.”

Kate on underwear: “I discovered these great undergarments I can’t live without called ‘Nearly Nude’…They’re so great. And you can wear them under any dress; they’re really thin. Also, Wolford makes a kind of slip that holds you in. It’s a little expensive, but women should invest in that! I don’t go anywhere without Calvin Klein strapless bras, and since I wear a lot of short skirts, I always have…my little boy-shorts to wear under the minis.”

Kate on girls being mean to each other: “Most of us have been in a situation where women are very threatened by other women. I’ve been in situations where just being happy was a threat to others. But I’m not like that. I was raised to root for other people. And I think we need that”

Kate on her new film Bride Wars: “My favourite part about the film was the importance of friendship – that’s really what the movie is about. It was hard to get that into the script because you’re telling a story about two women who are sabotaging each other’s wedding. With all of the pettiness that’s involved, it was so fun to see this movie because it’s a nice reminder that no matter how far you take it with your friends, whether you’re fighting with them or you hate them for two months, you just really need them, because they’re the ones who teach you the most about yourself.”

Kate on being a single mom: “Being a single parent can be difficult, but I don’t feel I am one. Chris and I are co-parenting and travelling is where it gets difficult. Chris is on the road and I’ve had a busy last year, so I am going to take a break in 2009. I want to soak in every little part of who Ryder is.”

Kate on being single: “I’m enjoying being single because I really never have been…“I feel good in relationships. I enjoy them, so I feel my best when I’m in something solid. But it’s the first time I’ve taken a step back and gotten a new perspective. I’ve made a conscious decision to try to stay single as long as possible.”

The March issue of InStyle UK hits newsstands today.