A spokesperson for the fashion designer and husband David confirmed on Sunday that they will welcome their fourth child together over the summer.
"Thank u so much for your kind and beautiful messages!!! We are all so happy and very excited!!!!! (sic)" she wrote on her Twitter account this morning.
David also spoke of his excitement at becoming a father again in a message posted on his Facebook page, describing the pregnancy as "great news" and saying that the pair's three sons - Brooklyn, Romeo and Cruz - are "very excited".
Celebrities have also been congratulating the Beckhams on their impending arrival, with Kylie Minogue tweeting: "WOW... Congratulations to @victoriabeckham and David... fourth child on the way!!!" and Victoria's former Spice Girls bandmates Mel B and Emma Bunton also revealing their excitement at the news.
A recent report suggested that the couple will remain in England for now before returning to Los Angeles later in the year, where Victoria will give birth.