The body of an 18-year-old Sydney teenager has been found in Australian bushland after an eight-day search.

Nearly 100 soldiers have joined the search for missing Sydney bushwalker Lily Hooper.

Lily Hooper was found on Thursday morning, more than a week after she went missing in dense bushland.

Lily Hooper had been missing in bush near Sydney for eight days.

Lily Hooper, 18, disappeared while hiking in Nattai National Park