It’s time for Jason Ritter to enter real-life Parenthood!

The actor and son of the late John Ritter has welcomed his first child, a daughter, with his actress fiancée Melanie Lynskey, a source confirms to PEOPLE.

No further information — including the baby’s name and birth date — are known.

While speaking with Hollywood Today Live in February 2017, the Castle Rock actress revealed to the show’s co-hosts that she and Ritter were engaged.

The proposal came as a surprise to the star, who admitted that she had no idea that it was coming. According to Lynskey, the couple had been dating for four years and met when they were doing a movie together.

And the couple’s engagement story is sweet and simple: Ritter proposed “on the sofa,” Lynskey, 41, said with a laugh. “It was cute.”

Ritter, who will next appear in Netflix’s upcoming sci-fi series Raising Dion, was congratulated last month by industry pal Neema Barnette, who shared a snapshot of herself with the new dad.

“Congrats to Raising Dion Co Star Jason Ritter & his wife on the birth of their beautiful Sag baby girl???Babies are a blessing & so is Jason!” the 69-year-old director captioned her celebratory selfie.

“What a hands down brilliant talent & exceptional human being he is!” she continued. “I’m blessed to have shared creative energy with you. Thank you for giving me a seamless performance.”