Keri Russell is positively glowing!

The pregnant 39-year-old actress showed off her baby bump at the NYC Season 4 premiere of her hit show The Americans on Friday, March 5. For the special occasion, Keri — who is expecting her third child — wowed in a black chiffon Gucci dress adorned with ruffles and pretty pearl buttons.

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Keri at The Americans premiere on March 5.

News first broke in early January that Keri and her boyfriend, Matthew Rhys, 41, are expecting their first baby together. “It’s so exciting for them!” a source told Us Weekly at the time.

RELATED: Matthew Rhys Opens Up About His Relationship With Keri Russell (EXCLUSIVE)

The Felicity star is already a mom to two kids — son River, 8, and daughter Willa, 4 — with her ex-husband, Shane Deary, whom she was married to from 2007 until 2013.