Sophie and husband, music man Jamie Cullum, are already proud parents to one-year-old Lyra.
Sophie's agent confirmed she was expecting baby number two after the mum-to-be stepped out at a red carpet event wearing a loose-fitting tunic, sparking rumours she was pregnant again.
The couple met at a charity ball, and married in 2010. Sophie, who is the granddaughter of writer Roald Dahl, has taken a break from modeling to work on her cookery books and BBC TV show.
Congratulations Sophie and Jamie!