How adorable are they?

Thomas Rhett and Laura Gregory
Credit: Jason Davis/FilmMagi/Getty Images

Thomas Rhett had the sweetest message for his wife Lauren on her first Mother's Day. A week after the adoption of their 18-month-old daughter Willa was finalized, the country crooner took to Instagram to honor his longtime love, who's also currently expecting their first biological child.

"Babe.. not only are you the hottest mom you are the sweetest, funniest most kind hearted human being that I know. I know you didn't plan on marrying a singer when you were sitting in your 3rd grade classroom, but I'm so glad you did," Rhett captioned a photo of Lauren and Willa examining a pink flowering bush.


The "Die a Happy Man" singer went on: "I couldn't imagine my life without you. Seriously you know how lost I get when you are gone for 2 weeks. I love you so much and happy 1st Mother's Day. You already are a rockstar at being a mom. You + me + Willa"

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The couple, who met in kindergarten and celebrated their four year anniversary in October, are already having quite the year—by August they'll be a family of four. "I think the way it all worked out, both of us have such a peace about this whole process, that it's so right," Lauren told People in February. "We could not be happier. We feel like 2017 is going to be our big year."