Heath Ledger's Treehouse Bought by 'Hunger Games' Star Josh Hutcherson

First a new nose, now a new house -- "Hunger Games" star Josh Hutcherson just nabbed an incredible $3 million Hollywood Hills mansion ... previously owned by Heath Ledger.

The 1,861 sq. ft. pad -- locally dubbed the "treehouse" because of its surrounding dense foliage -- has had many celebrity owners ... including Ellen DeGeneres, who sold the place to Heath and his then-girlfriend Michelle Williams in 2005.

As we reported, the 2-bedroom 2-bath house was listed last September for $2.995 million.

It's unclear if Josh paid full price ... but seeing as the odds are ever in his favor, we doubt it.