Pippa Middleton is reportedly pregnant with first child

Duchess of Cambridge prepares to give birth to her third child

Kate Middleton's sister Pippa and her husband James Matthews are expecting their first child. EPA / Facundo Arriza Balaga

Reuters

The Duchess of Cambridge's younger sister Pippa Middleton is pregnant with her first child, The Sun on Sunday reported.

The baby is due in October, the newspaper said citing an unnamed friend. Ms Middleton, 34, and her financier husband James Matthews, 42, married last year.

The Duchess of Cambridge "could not have been more delighted" when she heard the news of her sister's pregnancy.

Pippa Middleton was maid of honour at the 2011 wedding of her sister Kate to Prince William, who is second in line to the British throne.

The Duchess of Cambridge is also expected to give birth shortly to her third child. The baby will be fifth in line to the throne, ahead of Prince Harry.

Updated: April 22, 2018, 2:12 PM