Drew's rep confirmed the happy news to People last night (4 November), following her appearance at the LACMA Art and Film Gala in Los Angeles on Saturday (2 November), when she was spotted wearing a loose fitting dress.
The 38-year-old actress married art dealer husband Will at a star-studded ceremony June last year, at their home in Montecito, California. The couple welcomed their daughter Olive, now 13 months old, September last year.
Drew has previously spoken of her desire to have more children. She told Jay Leno in October that she "very much" wanted another baby, and was hoping to get pregnant "right away."
She added: "I grew up as an only child, and although that really works for some people and for some parents that's the way they want to do it."
Congratulations Drew and Will!
Check out other stars who are expecting a baby in the gallery below:
Copyright: Vimeo / Weiss Eubanks