The 35-year-old actress has been with her researcher partner since 2009. The couple have a 2-year-old son together named Solo!
It is not known how many months along Rosamund is, nor the sex of her child.
Rosamund is expected to start her press tour for Gone Girl later this year – the film is set to be released in the US on October 3. We can’t wait to see what chic maternity wear she rocks on the red carpet!
E! News was first to report the news.
Congrats to the happy family on the wonderful news!