Liev Schreiber and Taylor Neisen became parents recently.
According to images reported by Page Six, the couple lowkey gave birth to their first child together, the actor's third.
The joyful parents were spotted out and about in New York City on Wednesday while wheeling a stroller, despite the fact that the actual date of the infant's birth remains uncertain.
Neisen wore the infant in a tan baby sling while Schreiber drove the baby carriage.
Only the top of the baby's head poked out from the wrap, leaving the baby's face and body completely hidden.
The couple, who were both wearing casual clothing for the occasion, made several stops to check on their infant as they moved around Soho.
Prior to giving birth, Neisen did not publicly disclose her pregnancy on social media, but the 31-year-old casually showed off her baby belly while out for a walk with Schreiber in April.
The model covered her growing pregnancy the next month as she walked numerous red carpets with her partner while wearing flowing robes.
The couple started dating in 2017, keeping their relationship largely secret.
The 55-year-old Ray Donovan veteran previously dated Naomi Watts from 2005 to 2016.
The former couple gave birth to Sasha, now 16, and Kai, now 14, in 2007 and 2009, respectively.
The former couple has maintained a unified front while co-parenting their children even as the actor moved on with Neisen and Watts ignited engagement rumours with Billy Crudup.