Kelis believes faith helped her give birth.

The 'Acapella' singer, who has nine-month-old son Knight from her former marriage to rapper Nas, admits her faith in God is stronger because of her natural childbirth.

She said: "It was really savage. I was in labour for 67 hours.

"I went natural, and it was savage! If you ever doubted the glory of God, you have to rethink that after having a baby.

"I mean there's no way I could have done this by myself. There is a creator."

She also admits that hitting the age of 30 in August 2009 gave her a whole new outlook on life.

She said: "My mom always used to tell us, 'Your twenties? Whatever. In your thirties you'll be your most beautiful, your sexiest, your smartest.' I've been through so many life changes getting here, it's like, she was right'."

Discussing her upcoming album 'Flesh Tone', she claims pregnancy helped her record her best work yet.

She told Style magazine: "Being pregnant and recording was awesome. I just felt I had so much to say."