What a beautiful little creature! It's hard to tell from the photos, but it looks like you may have found a Lionhead rabbit. They're a breed known for the large 'mane' of fur up around their heads, and the extra fur around the flanks. My wife and I rescued one several years ago, and she was a wonderful girl.

If it is a Lionhead, then chances are almost certain it's either someone's pet or a breeder's animal that escaped or was released into the wild. They're a designer domesticated breed that comes from mixing two other specific breeds, so you won't find them running around in the wild. I hope it finds its way home. :)