Robbie Williams expecting first child

British pop singer Robbie Williams says he and his American actress wife Ayda Field are expecting their first child this year.

Williams - the voice behind hits such as Kids and Angels - took to his blog on Friday to tell fans that he has "been keeping a secret".

"Me and Ayda are going to be a Mummy and Daddy this year!!!!!!!!"

He added: "We had sex! It works!"

The 38-year-old star's blog post says he and his wife "had seen scans and cried" in happiness at the news and are already planning a nursery.

"Basically I'm in love with a little person growing in mummy's belly ... and can't wait to be a daddy," he wrote.

Williams rose to stardom first as a member of the boy band Take That in the 1990s, and later when he pursued a solo singing career with tracks such as the popular Millennium.

He and his wife tied the knot in August 2010.

With AP