Matthew Rhys Jokes That Pregnant Keri Russell Is ‘Now Incredibly Effective with a Blow Dart from a Seated Position’

‘The Americans’ costars are expecting a child together

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Keri Russell and Matthew Rhys‘ exciting pregnancy news hasn’t affected their roles as KGB spies on The Americans — in fact, according to Rhys, Russell is just as sharp of a shooter, if not better!

During a Television Critics Association’s panel for the hit FX series in Pasadena, California, on Saturday, the expectant parents and executive producer Joel Fields were asked if Russell’s real-life pregnancy impacted the story line for the spy drama. (Russell, 39, and Rhys, 41, play a pair of Soviet KGB officers in an arranged marriage who are posing as Americans in suburban Washington, D.C.)

“No, it did not. We actually haven’t made any changes based on the happy news, except that we are happy,” Fields said.

Rhys then chimed in with a hilarious response: “And she’s now incredibly effective with a blow dart from a seated position at 12 feet.”

When Rhys was asked about impending fatherhood, the actor cracked a joke to reporters: “As soon as I find out if it’s verified or true, I’ll be over the moon.”

A source confirmed to PEOPLE earlier this month that Russell is expecting a baby with her costar Rhys and that the couple is “thrilled.” Already mom to daughterWilla Lou, 3, and son River, 7½, this will be Russell’s first child with Rhys.PEOPLE confirmed in April 2014 that the two are dating after months of relationship rumors.

Though Russell didn’t address the pregnancy news, the actress did open up about her character Elizabeth’s role as a mother on the show.“I think there is a big opening for Elizabeth in a new way, especially with [her daughter] Paige and seeing how it’s affecting her, and I think that’s a very parent thing,” Russell said. “You try your best, and you think you know what’s right, but you are not you have no idea how they are going to react as an individual.”

–Aurelie Corinthios with reporting by Christina Dugan