Paris Hilton is desperate to marry new beau Benji Madden - because the Good Charlotte rocker has changed her life for the better.

The pair has denied rumours they'll be exchanging nuptials anytime soon, but Hilton admits the birth of her on/off best friend Nicole Richie's daughter Harlow in January, with Benji's twin brother Joel, has made her broody and eager to settle down.

She says, "It's actually perfect. (Nicole and I) are like sisters, and they're twins so it works out well. We do talk about (marriage). I'm so happy. I'm so in love. And I know I want to spend the rest of my life with him.”

The couple has been plagued by rumours their romance is merely a publicity stunt since they began dating earlier this year, but Hilton insists their affection is genuine: "If you saw us together you'd understand. He's my boyfriend and my best friend.

"We've been friends for over six years now and when (Nicole Richie) had Harlow I started going over to the house and we just got a little crush on each other and totally fell in love. He's hot."

Hilton, who joined Good Charlotte on their European and South African tours last month, will again be joining the band when they tour America this summer.

She adds, "He's not like (a typical musician) at all. He's the most loyal, honest and incredible person in the world. I feel just blessed to have found him. He's changed my life."