On Thursday, Aug. 22, the singer celebrated her 29th birthday with a carousel Instagram post of her holding a pink-and-red balloon bouquet ... sign up for PEOPLE's free daily newsletter to stay ...

which included a handful of Glinda-coded pink balloons. Slater posted a picture of Ariana Grande holding the balloons while ...

While country megastar Luke Bryan was off enjoying a peaceful evening of fishing with the couple's nephew, Til, his wife, Caroline, decided to stuff herself into a giant pink balloon.