Congratulations are in order for Keri Russell and boyfriend Matthew Rhys! The Americans co-stars have been blessed with their first child as a couple.

Keri, best known for playing the role of Felicity Porter on the series Felicity, gave birth to the little bundle of joy sometime last week, a source told US Weekly.

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The 40-year-old actress' mother and brother "have been staying with Keri for the last week, spending all their time doting over the baby," the source said.

Keri and Matt both look overjoyed and are over the moon to be new parents," the insider added. "They are always snapping pictures of the baby, and family and friends have been sending gifts."

Matthew, 41, was recently seen carrying the newborn in a car seat in pictures obtained by Daily Mail.

This isn't Keri's first child. The actress already shares two children; an eight-year-old son, River, and a four-year-old daughter named Willa, with ex-husband Shane Deary, whom she divorced in 2013 after almost seven years of marriage.

Matthew and Keri feature as undercover KGB agents on the hit FX series. The proud parents were rumored to be dating for quite some time but kept their relationship under wraps before going public with their relationship in April 2014.

In the past, Keri as opened up about how motherhood changes everything.  "You instantly become less selfish," she told Parade in 2013. "You can't be the biggest person in the world anymore-they are. It really grounds you."

"I like working hard, but my life outside of my career is equally important to me," she added. "Maybe I'm not ambitious enough, but I'm just as interested in my friends and my relationship with my family."

TagsKeri Russell, Keri Russell Matthew Rhys, Matthew Rhys, The Americans