Russell delivered "The Americans" co-stars' first child last week, according to Us Weekly. The couple was photographed Monday strolling around in New York City, with Russell cradling a baby, the Daily Mail noted.
It's the first child for the 41-year-old Rhys, USA Today wrote. His 40-year-old partner has two other children, daughter Willa Lou, 3, and son River, 7, from her previous relationship with Shane Deary.
The birth coincides with good professional news for the couple, who play KGB spies on the "The Americans," ET notes. The FX show was renewed for two more seasons.
The Huffington Post has reached out to reps for Russell and Rhys for comment.