From the moment he appeared as a teenage hopeful on the British version of the X-Factor, the life and career of Harry Styles was only heading in one direction - up. His outlay on his mansion may be quite low compared to some of the other names on this list; a mere $4m; but bear in mind he's had much less time to make his riches than most famous people. He's still a young man in his 20s. Maybe his age played into his choice of home; it looks a little more like a tree-house than a mansion!
The place to be seen when you're rich, famous and young is Los Angeles, and so that's where Styles has set up camp. In what seems to be a new trend, he's gone for a saltwater pool rather than a more traditional offering, and the whole place has a bit of a nature vibe going on.