The youngest son of Mukesh Ambani, Asia’s richest man, married his longtime girlfriend early Saturday in what many dubbed the wedding of the year, attended by global celebrities, business tycoons and politicians, highlighting the billionaire’s staggering wealth and rising clout. The guest list includes former British Prime Ministers Tony Blair and Boris Johnson; Saudi Aramco CEO Amin H. Nasser; and Adele, Lana Del Rey, Drake and David Beckham, according to local media.