Taking to Instagram on Saturday, Aug. 15, the Game of Thrones alum shared a sweet birthday tribute to her husband and father of her child.
"Happy birthday to my love/bub/baby daddy," she captioned her post, alongside a black-and-white image of herself with the Jonas Brothers singer.
Naturally, fans couldn't get enough and gushed over the pair in the comment section. "COUPLE GOALS JOINED THE CHAT," one user responded. Another chimed in, "Not me almost crashing my car when you posted this lol."
Others were surprised by Sophie's post considering it's the first time she's publicly addressed the baby news and commented on Joe's fatherhood. "BABY DADDY HOLY S--T," one fan replied. "OMG BABY DADDY," another added.
Last month, reps for the duo confirmed to E! News that they had welcomed their little one. "Sophie Turner and Joe Jonas are delighted to announce the birth of their baby," a statement read.
While the first-time parents continue to remain silent about their newborn, TMZ reported the actress gave birth to a baby girl on Wednesday, July 22. They allegedly named their daughter Willa.
In late July, a source told E! News that Sophie and Joe were soaking up each moment with their little one.
"They are home and getting settled. Joe is very hands-on and involved. He wants to do everything he can and loves being with the baby and helping Sophie," the source described, adding, they've "been texting pictures to friends and calling on FaceTime to show her off."
Sophie wasn't the only one to wish the singer a happy 31st birthday on Saturday. His nearest and dearest gave him shout outs on social media.
"You're the funniest person I know and I love celebrating you. I feel so lucky to have you as my brother. I love you so much. Happy birthday @joejonas," Nick Jonas shared on Instagram.
"Happy Birthday Joe," Priyanka Chopra wrote. "This photo has been 'hand picked' by yours truly. Have an amazing day!" Kevin Jonas added, "Happy birthday @joejonas love you man. Hope you have an incredible day!!"
On Instagram Stories, the 31-year-old shared a selfie of himself holding up a mimosa. "Thanks for all the love babes," he wrote.
Considering Joe and his daughter share the same sign, it's safe to say Leo season is going strong in his and Sophie's household.