Melanie Lynskeyis a proud mama.
“We feel lucky to have been able to have our news just be for friends and family for a while, but I guess the story got out, so! Yes! @JasonRitter and I had a daughter in December,” Lynskey, 41,wrote in her first post. “We love her so much; she’s perfect. Thanks to everyone for your sweet messages.”
“The good thing about our news being put out there is that now I do get to publicly thank the wonderful doctors and the amazing heroic caring brilliant nurses of@NSH_Maternityin Atlanta,” Lynskey wrote in a final message. “From labor & delivery to post partum, every one was an angel and I’m eternally grateful ❤️”
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A source confirmed to PEOPLE on Monday that Ritter — a 38-year-old actor who is the son of the lateJohn Ritter— and Lynskey had become parents for the first time.
While speaking withHollywood Today Livein February 2017, theCastle Rockactress revealed to the show’s co-hoststhat she and Ritter were engaged.
Chelsea Lauren/REX/Shutterstock

The proposal came as a surprise to Lynskey, who admitted that she had no idea that it was coming. According to the star, the couple had been dating for four years and met when they were doing a movie together.
And theirengagement story is sweet andsimple: Ritter proposed “on the sofa,” Lynskey said with a laugh. “It was cute.”
Chelsea Lauren/Variety/REX/Shutterstock

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“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.”
source: people.com