AceShowbiz - Jason Ritter and his longtime girlfriend Melanie Lynskey are parents to a new baby girl.

The former "Two and a Half Men" star gave birth quietly at the end of last year (2018) but the couple kept the baby news under wraps until a pal, director Neema Barnette, congratulated Jason publicly on Instagram in December.

"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!".

View this post on Instagram

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! What a hands down brilliant talent & exceptional human being he is! I’m blessed to have shared creative energy with you. Thank you for giving me a seamless performance👌🏾 @raise.the.vibe.tribe @jason_ritter @iamcharlesdking @netflix @gatelife @raisingdionnetflix

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A post shared by Neema Barnette (@neemafilms) on Dec 18, 2018 at 9:58pm PST

Us Weekly has now confirmed the news.

Ritter and Lynskey became engaged in early 2017. Melanie was previously married to "Westworld" star Jimmi Simpson.