Kelis thinks women write better music when they're pregnant.

The 34-year-old singer, who has four-year-old son Knight with ex-husband Nas, claims her last album 'Flesh Tone' in 2010 was one of her best records because she was expecting her first child when she recorded it.

She said: ''For me, my last album was the brightest, just because I was pregnant when I recorded it and that's a really powerful time for a woman artist. If I think about female artists in the past 15 to 20 years that I love, I look at their body of work and I'm like, 'Oh, she was pregnant then!' It makes so much sense. And 'Flesh Tone' definitely signifies that. It's about life, it's a very robust record.''

The 'Milkshake' hitmaker will release her next record, 'Food', on April 18, and insists it's ''different'' from her previous albums because she's in a more settled place.

She told NME magazine: ''I'm very content, and as much as I didn't want to acknowledge that that would happen four or five years ago, being a mother totally has made that happen.''