Disney's Sofia the First Princess Birthday Party Theme. Have your little princess be First In Class with Princess Sofia in this adorable vibrant princess party theme. Get your Disney's Sofia the First Party started with up to 50% or more off Disney's Sofia the First Party Supplies. Join Princess Sofia in becoming an extraordinary princess in training. Sofia the First teaches and emphasizes manners and kindness as qualities of a real princess. You will find a large selection of Disney's Sofia the First party supplies all at our usual discount prices.