In this episode, Katherine meets the husband and wife team that went from running a market stall to becoming the founders of the £50 million retail chain Poundland. How did they do that? She also meets Britain's flashiest playboy, who started out in pop music then made his millions owning hotels in central London. And in America, she meets the richest cosmetic surgeon in the world, who's performed surgery on numerous stars.

Katherine Ryan meets the richest plumber in Britain; the Monaco-based twins who host the most exclusive yacht parties in the world; and the 10-year-old girl who made her first million by the age of six. As always, the burning question is: How'd You Get So Rich?

Katherine Ryan continues her search for some of the world's richest people. This time she meets the man who made his fortune running gay bars; the American couple who got rich designing an app and now travel the world for free; and the former Mafia boss who these days earns his money as a preacher.

Katherine Ryan continues to hang out with a selection of the richest people in the world, including two men who made their millions from selling sex toys, a woman who creates luxury creams from bee venom and a man who designs the most exclusive cars on the planet.

Katherine Ryan meets a 22-year-old millionaire poker player. She goes on a house hunt with former Big Brother contestant Aisleyne Horgan-Wallace, who is now a property mogul. And Katherine hangs out with a billionaire interior designer to the stars.

Katherine Ryan meets a man who got rich from caravan parks, a motivational speaker who made money helping others and a man who can gold plate anything to order.