Personalized 3rd Birthday Princess I'm Three Youth T-Shirt. 3rd Birthday gift for your little girl who will look so sweet wearing a cute The Princess Is Three crown Youth T-Shirt - White gift that is perfect for her special third birthday celebration party. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.