The 38-year-old actress and Kopelman welcomed their first child Olive in 2012. After announcing her second pregnancy last year, Barrymore revealed that she was expecting another daughter, reported People magazine.
"I got a puppy while pregnant with the toddler and my husband (Will Kopelman) was like, 'You are insane!' I was like, 'I am!'. I mean, let it rain. When it rains, it pours. That was my mentality," Barrymore said.
The actress is planning a low key Valentine's Day celebration this year.