Pregnant singer Lily Allen has apparently revealed to her pals that she's expecting a boy.

The 25-year-old singer could not wait to share the news that a scan had shown the sex of her first child.

Allen is four months pregnant by boyfriend Sam Cooper and the couple have already said they are absolutely delighted at the prospect.

"Lily said she found out from a scan she is having a boy," the Sun quoted a source as saying.

"She is really excited and can't wait to give birth. She is always asking other mums about their pregnancies," said Cooper.

She hid her bump under a long black dress when she took part in the GQ Awards bash in London and has told friends that she is looking into antenatal classes and yoga. (ANI)