Thomas Rhett's oldest daughter turned three on Thursday (Nov. 1), and the country singer was feeling mushy.

"Happy birthday sweet baby girl!" he writes next to a photo of the two of them on the beach, Willa Gray holding onto his neck as he looks at her lovingly.

"How in the world are you 3 already?!?! I need to pause life cause it’s just moving too fast. I love you more than anything in the world," Rhett adds.

The singer's wife, Lauren, also shared several photos of Willa, from first meeting her in Uganda to eventually adopting her in May of 2017, to bringing her home to Nashville.

"My sweet, smart, soooo goofy beautiful baby girl who made me a mama," the proud mom writes. "Life is so fun with you and you are the BEST big sister to Ada James. Your sweet little spirit makes the world around you a better place. I am so proud of who you are Willa Gray girl. Love you to the moon and back always."

Lauren previously detailed how Willa Gray stole the couple's hearts when they met her in 2016. Lauren frequently travels to Uganda to help the non-profit 147 Million Orphans, which provides critical care to children who have been impacted by the orphan crisis and are living in poverty.

Willa Gray is Rhett and Lauren's first child. They're also the biological parents to another daughter, Ada James, born in August 2017.

These Pictures Prove That Thomas Rhett and Lauren Akins Are Meant to Be: