Bindi is 9!

7/24/2007 8:51 AM PDT BY TMZ STAFF
The world's most precocious 8-year-old just became the world's most precocious 9-year-old!

Bindi, chock full of animal magnetism, will be celebrating her birthday with a "mad celebration" at the Australia Zoo, where all kids under 14 will get in free! Plus free face painting and free rides! Crikey!

Steve Irwin was killed ten months ago while diving near the Great Barrier Reef, when a stingray barb pierced his heart.