Personalized It's My Birthday Cupcake Youth T-Shirt. It's my birthday! A cool cupcake wearing sunglasses is throwing a big birthday party just for you. Balloons, party hats, confetti, and cupcakes! 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.