Celebrate a birthday with this fun 'Pop It! Sister of the Birthday Girl' t-shirt. The design features colorful, pop-it style graphics of a puzzle piece, unicorn, popsicle, heart, ball, and drink. Perfect for birthday parties or everyday wear. It makes a great gift for the sister of the birthday girl! The playful design is sure to bring a smile to everyone's face. Get ready to pop some fun with this unique and vibrant tee. Available in black, this shirt is a must-have for any birthday celebration.