On Sunday, the "Star of the Show" singer took to Instagram to share a photo from the sweet celebration, writing, "I can’t believe Willa Gray turns 2 this week!! Time goes by so fast."
Rhett, 27, added, "This was a unicorn-themed party and I can see Willa wanting a horse in the near future."
The photo finds the happy trio posing alongside a table featuring a scrumptious-looking birthday cake — with a unicorn horn! — and yummy candies. Behind them, a pretty paper unicorn hangs beside other colorful birthday decorations.
This past August, just three months after bringing Willa Gray into their home, the couple welcomed their second child, daughter Ada James.
Rhett recently noted to People, "For two weeks, (Willa) was like, 'Who is this person who came in and took some of the attention away from me?' But now she’s super protective of Ada and is just turning into an amazing big sister."
Aww! Here's wishing little Willa Gray the best birthday ever!