Speaking in a Facebook chat with Travel and Leisure magazine Anna herself initially revealed the big news, telling fans that she's planning on a family holiday before she welcomes her new baby.
'Being expecting as I am, we're going to keep it low-key and try to get a beach vacation in pretty soon,' she said.
A rep for Anna confirmed the happy revelation to E! News, saying her and her husband Shaun So most certainly would be expecting a new addition to their family in 2016.
Anna and her husband Shaun So have been married for eight years
Anna is now best known for her role as Amy Brookheimer in American drama series Veep. Her and her husband already have one daughter, two-year-old Penelope Joan.
In a recent interview with People she spoke about the joys of motherhood, saying, 'it's awesome. I love it.' Anna, 35, then went on to talk about how much she's enjoying her daughter's early years, saying, 'She's becoming her own person and it's delicious to watch.'
Anna has had a successful acting career since My Girl, starring in films like Hannibal
The actress continued, 'she's really fun and really sweet. And she's very determined. I love all those things about her. If she wasn't my daughter, I'd want to hang out with her still. She's really good company.'
Anna also explained that she was learning how different motherhood can be for people, with no 'right way' to do it. The actress said, 'This whole thing has taught me that motherhood has a wealth of definitions and identities.
'There's no one way to be a mom or one way to be a "good" mom.'
Anna and her husband Shaun, who have recently celebrated their eighth wedding anniversary together, have yet to reveal their due date. We can't wait to see the new arrival!