The fashion designer has taken to Instagram.com to announce that she and style guru Ralph Lauren's son, David Lauren, are preparing to become parents in the autumn (15).

A message on the social media site reads, "We feel blessed and excited to welcome our little one to the world this November!"

The couple wed in 2011.

Lauren is the daughter of Neil Bush and his wife Sharon.

The 31 year old is not the only Bush family member expecting - her cousin, Jenna Bush Hager, will welcome her second child with husband Henry Hager in August (15).