I keep a diary when I have time to. I always know that I'm either having a great time or I'm very busy when there are three weeks of nothing in my diary. But I like to look back because in ten years to the day I can know where I was and what I was doing, and that's a nice feeling.

I live my life in gratitude.

I am lucky to have the greatest band and when you add a symphony orchestra to the mix it brings all of my songs to a whole new level. I wouldn't say I really change what I do but, having those talented musicians behind me, along with my band, really makes the songs so much bigger and more fun to sing.

As for highlights, of course "Grease" changed my life and I will always be grateful for that experience.

There's a balance in my life, there's reality and there's the part that looks really glamorous, but we're all just people in the end.

John [Travolta] and I have remained very close friends ever since we did Grease. When I was told that "You're the One That I Want" was named the #1 duet in history and, during a text chat with John letting him know he said "we should record a Christmas song." Of course I said yes.

Being a breast cancer survivor, as I like to call myself - it will be twenty years next year - I did it to make it possible for women to do regular self breast examinations. It's really important - and, it makes common sense: you know your body better than the doctor does who only sees you once a year, you know?