Hello Kitty Balloon Dreams Birthday Party Supplies. The best little girl's Birthday Party Ideas start with a great birthday party theme, so for a fantastic Hello Kitty Birthday start with our amazing selection of Hello Kitty Birthday Party Supplies. Hello Kitty makes a great party theme idea for an amazing girl's Birthday Party! Why not have one of the most popular girl's birthday party themes this year with an outstanding Hello Kitty Birthday Party! Great Birthday Parties start with great Birthday Party Supplies!