EXCLUSIVE: Keri Russell's Pregnancy Confirmed By 'Americans' Co-Star Noah Emmerich

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The 39-year-old actress is expecting her first child with actor Matthew Rhys.

Keri Russell
officially has a bun in the oven!

After much speculation that she was expecting her third child, Russell's The Americans co-star, Noah Emmerich, confirmed the news to ET on Saturday at the FX TCA winter press tour.

WATCH: Keri Russell Expecting First Child With Matthew Rhys

After first joking "what pregnancy?," Emmerich explained that Russell's baby bump will not be a part of the show's storyline.

"First of all, Keri's really petite. It looks like she swallowed a large pea," he told ET. "But yes, we shoot around it."

"She's always standing behind a huge counter with a toaster on it," Emmerich jokingly added. "No, there's only a few angles where you can see it. It's fixable -- just picking your shots."

This will be the first child for the 39-year-old actress and her boyfriend, Americans co-star Matthew Rhys, who first went public with their relationship in April 2014.

WATCH: Keri Russell and Matthew Rhys Aren’t the Only Couple Who Fell in Love on Set

The Felicity alum already has two children, 8-year-old River and 4-year-old Willa, with her ex-husband, Shane Deary. The two divorced in 2013.

Just last week we got a glimpse at Russell's burgeoning belly -- check out the pics in the video below.