Meghan Markle, Prince Harry expecting their first child

Meghan Markle is pregnant with her first child.

Kensington Palace has confirmed the Duchess of Sussex is due to give birth to her and Prince Harry's first baby in spring 2019.

"Their Royal Highnesses have appreciated all of the support they have received from people around the world since their wedding in May and are delighted to be able to share this happy news with the public," Kensington Palace said in a statement.

The Duchess sparked pregnancy rumours earlier on Monday when she was spotted holding two large folders in front of her stomach as she stepped off the plane in Sydney.

Her decision to only button her coat halfway up when attending Princess Eugenie's wedding over the weekend was also interpreted as a pregnancy signal.

A blue ruffled dress she wore to a benefit concert in September caused many to speculate whether she might be expecting.

The couple's future children will have the title 'Lady' or 'Lord', thanks to an order passed by King George V in 1917.

Prince Harry and Meghan Markle will touch down in New Zealand on October 28 as part of their first official royal tour together.