Kate Bosworth is ''incredibly happy'' to become a stepmother.

The 30-year-old actress says one of the best things about tying the knot with filmmaker Michael Polish this summer was officially becoming a mother figure to his 15-year-old daughter, Jasper, a role she takes very seriously.

She told Los Angeles Confidential magazine: ''I've never had an older sister or brother, and she's an only child, so I feel we really understand each other in a special way. If I can make a positive impact on her life, that will make me incredibly happy.

''Having Jasper in my life takes me right back to being that age. It's challenging - it's a time when you're so hard on yourself, and not for a great reason, but because you haven't experienced enough to be able to understand a lot of things.''

The 'Blue Crush' star met Michael on the set of 'Big Sur' in 2011, shortly after her romance with Alexander Skarsgard ended, and immediately felt a connection with him.

Kate gushed: ''I feel like I've known him my whole life, and he feels like he's known me my whole life. And that's something very special that's difficult to describe without sounding like a Hallmark card.''

The couple tied the knot in a low-key ceremony at Rock Creek in Montana, and Kate believes the state is the perfect place to settle down and start a family.

''We have grizzlies roaming around. We're on a lake, so we can just go ice-skating. It's beautiful, so as we start a family, we can really create a special place there together.''