Nicole Kidman thinks love is ''the be-all and end-all.''

The 'Railway Man' star has been married to Keith Urban for seven years and admits he means everything to her.

Asked what love means to her, she said: ''It's the be-all and end-all. It's your salvation. It's the thing that keeps you all right, and hopefully, if you're on the right path, it envelops you and keeps you safe. If you find it, you don't let it go.''

The 46-year-old star recently admitted Keith showers her with love notes when they're apart in order to keep their relationship exciting.

She said previously: ''For every single night he's away, he leaves me a love letter. Every single night of our relationship. It keeps us close.''

When Nicole isn't filming, she enjoys accompanying the 'American Idol' judge on tour with their daughters Sunday Rose, five, and Faith Margaret, three, because she gets to indulge on fast food.

She said earlier this year: ''Keith and I eat at Wendy's. You've got to remember, I'm with a musician on a tour bus. We do drive-throughs!''