"So happy to be on this wild journey with my soulmate," the 27-year-old captioned a black-and-white pic of her baby bump and a snap with her longtime boyfriend Alex Oxlade-Chamberlain on Monday, May 10.
"Me + Him = You 🌎♥️ We can’t wait to meet you baby Ox!" she added.
"Anyone got any advice on how to change nappies? 😅 so grateful and excited to become a dad ❤️ bring on the sleepless nights 🤪," the soccer player captioned the same pictures on his account.
The singer's A-list pals and fans rushed to the comments to offer their congratulations.
"Arghhhhhhhh so so so happy for you both! And so bloody happy we get to go on this journey together! Love you so much ❤️❤️❤️❤️❤️❤️❤️," Pinnock gushed in the comments.
"Beaming for you both ♥️. I’m the luckiest auntie in the world! Love youuuuu x," fellow Little Mix member Jade Thirlwall added, while Zara Larsson commented: "Omggg!!!!!! Congrats!! Im so happy for you!! ❤️❤️❤️❤️❤️❤️❤️❤️."
Edwards and Oxlade-Chamberlain have been dating since 2017, and this is their first child together.
"We've dreamed about this moment for so long and we can't believe the dream is finally coming true... we can't wait to meet you. ❤️😍," Pinnock shared last week with snaps from a stunning maternity photoshoot with fiancé Andre Gray.
"I can’t stop staring at these pictures. You’re a vision. Ily both so much! CONGRATULATIONS my beautiful sister! ♥️," Edwards commented on her bandmate's pregnancy reveal.
"😭😭😭😭😭 love you so much 💚 look at this family 🥺😭💚💫," Thirlwall said.
Last year, Little Mix's fourth member Jesy Nelson left the band due to the toll it took on her mental health. "I find the constant pressure of being in a girl group and living up to expectations very hard. There comes a time in life when we need to reinvest in taking care of ourselves rather than focussing on making other people happy, and I feel like now is the time to begin that process," the 29-year-old announced in December.
"This is an incredibly sad time for all of us but we are fully supportive of Jesy. We love her very much and agree that it is so important that she does what is right for her mental health and well-being," Edwards, Pinnock and Thirlwall said at the time.
They continued, "We are still very much enjoying our Little Mix journey and the 3 of us are not ready for it to be over. We know that Jesy leaving the group is going to be really upsetting news for our fans. We love you guys so much and are so grateful for your loyalty and continued support of all of us. We’re looking forward to seeing so many of you on tour."