40. Gian Luca Passi de Preposulo — Fiol Prosecco cofounder

Gian Luca Passi de Preposulo popped up in the media a couple of years ago when he married Hollywood actress Jessica Chastain in the grounds of his family estate in Italy. The Italian noble is PR director of events and entertainment at Italian fashion house Moncler, but it's his side-hustle that we're interested in.

Passi de Preposulo is the cofounder of fast-growing, premium prosecco brand Fiol.

The Italian is hoping to disrupt the prosecco market with his higher-end offering, and make it a recognizable brand in a market that's been saturated by innumerable low-cost options. It's going well so far — they've won gold at the Drinks Business' Prosecco Masters awards two years in a row.

Read more: Jessica Chastain's fashion executive husband has his own brand of fizz — and he wants to make it the Belvedere of the prosecco world