Pippa Middleton is reportedly pregnant with her first child

Pippa Middleton is pregnant, according to a UK tabloid.

The Duchess of Cambridge's younger sister told close friends and family last week, reports The Sun, following her 12-week scan.

She "could not have been more delighted", a friend told the paper.

"When Pippa found out she was pregnant, she was obviously thrilled and utterly overjoyed," they said.

Her sister Kate is soon to give birth to her third child with Prince William. Prince Harry, William's brother, is soon to wed Suits actress Meghan Markle.

Pippa, 34, married financier James Matthews, 42, last year. If the reports are true, this will be their first child.

Newshub.