Surrounded by palm trees and azalea bushes on a lush Brazilian estate, Greek billionaire Athina Roussel Onassis will say ‘I do’ to an Olympic athlete on Saturday in what Brazilians expect will be one of the most lavish weddings in years.

Young millionairess Athina Onassis Roussel will marry her Brazilian boyfriend in December, after gaining control of half of her late shipping tycoon grandfather Aristotle Onassis' massive $1.2bn (€934m) fortune.