Tim McGraw & Faith Hill Celebrate Daughter Maggie's 21st Birthday

Today - Season 66

Can you believe Tim McGraw and Faith Hill's little girl is a grown-up now?!

On Monday (August 12), the country superstars' second daughter, Maggie, turned 21 and celebrated the occasion with family and friends over birthday cake. After blowing out her 21 candles, McGraw and Hill both shared touching tributes on Instagram to honor her passage to adulthood.

"Happy 21st to our Maggie May!!! Your mom, sisters and I are so very proud of you," the "My Best Friend" crooner captioned a gallery of images of the birthday girl. "All of your adventures and passion for life is infectious! Don’t ever stop being willing to learn. Your mother and I never tire of your eagerness. We are SO very fortunate to have you and your sisters in our lives!!! Let’s get out there and make some more memories!"

In another dedication post, Hill shared a throwback clip of her and Maggie's favorite pastime: singing songs together in the car. "This crazy girl is 21 years old today. Let’s get the party started!!!!! Taking it back three years ago....road trippin’ with the birthday girl. We love you, Maggie Mcgraw," the 51-year-old wrote along with a video of the pair singing Bruno Mars' "Uptown Funk."

As you know, Maggie's the middle-child, right after older sister Gracie, who turned 22 back in May, and before her younger sis, Audrey, 17.

Happy belated birthday, Maggie!

Photo: Getty Images