 The son of Asia's richest man is marrying the daughter of pharmaceutical tycoons in a three-day wedding ceremony getting underway in the Indian city of Mumbai. A host of stars and dignitaries will be there to see Anant Ambani, the youngest son of the chairman of Reliance Industries, Mukesh, tie the knot with his longtime sweetheart, Radhika Merchant. The families are thought to be spending at least $250 million on the mega-wedding.