They are married to the wealthiest individuals in the world but a few of them have etched out their own identity, with two Indians, Usha Mittal and Tina Ambani making a cut in the latest 'Wives of Billionaires' list compiled by US business magazine Forbes.
Usha Mittal is the wife of world's fourth richest person and steel tycoon Lakshmi Mittal while Tina Ambani is married to sixth wealthiest person Anil Ambani, whose flagship firm Reliance Communications is currently in talks with South African telecom major MTN for a possible amalgamation.
In an article on its website, Forbes said that "gaining membership to the billionaire wives' club is no easy feat. So what does it take to marry one? For starters, looks are great but brains are even better."
Taking about 53-year old Tina Ambani, the magazine said that "being famous of your one accord is often a plus." Prior to marrying Anil Ambani, Tina Munim was a famed Bollywood actress, it noted.
She made her name in the 1978 Hindi blockbuster Des Pardes and has starred in more than 30 films and "now her husband, Anil Ambani, ranked sixth-richest in the world in March, is reportedly in talks through one of his companies to become Steven Spielberg's Dreamworks SKG's principal financier.
"Patron of contemporary Indian art is mother of two sons," it noted.
At the same time, Usha Mittal, wife of the world's fourth richest person and who has apparently worked in the steel business for 15 years, has clearly earned the trust of Lakshmi Mittal, Forbes said.
"Last year, his steel company, ArcelorMittal, passed a resolution that entrusted her with temporary responsibility of managing the world's largest steel company if the managing board of directors is permanently absent or prevented from handling duties. She apparently worked in the steel business for 15 years, at one time reportedly running a plant in Indonesia.
"She is also the namesake of the Usha Mittal Institute of Technology, a university that promotes the womens' education in India," the magazine added.
According to Forbes, Lakshmi Mittal has a personal fortune of $45 billion whereas Anil Ambani's net worth is pegged at $42 billion.
Hollywood celebrity director Steven Spielberg's wife Kate Capshaw, Larry Ellison's spouse Melanie Craft, Susan Dell who is the wife of Michael Dell, media baron Rupert Murdoch's spouse Wendi Deng, Kenneth Griffin's wife Anne Dias Griffin, Lucy Southworth who is married to search engine giant Google co-founder Larry Page and Barry Diller's wife Diane Von Furstenburg are part of the list.
Interestingly, wives of only three people among the world's top 10 richest have made it into the list, which has a total ten such women. Apart from Usha Mittal and Tina Ambani, the other person is Melinda Gates, wife of Bill Gates, the world's third richest billionaire.
In March, Forbes had ranked legendary investor Warren Buffet as the richest person with a fortune of $62 billion. He was followed by Mexican telecom tycoon Carlos Slim Helu with a net worth of $60 billion while Bill Gates slipped to the third spot from the previous year's top ranking, with wealth to the tune of $58 billion.
Anil Ambani's elder sibling Mukesh Ambani was ranked as the fifth richest in the world with a net worth of $43 billion.
Another Indian, K P Singh, the man behind realty major DLF was ranked at the eighth place with a personal wealth of $30 billion.
Other members in the top ten league are retailer Ikea's Ingvar Kampard at the seventh spot ($31 billion), Russian billionaire Oleg Deripaska ($28 billion) at the ninth place and Germany's Karl Albrecht procuring the tenth position ($27 billion).
While all the ten of them are married, Carlos Slim is widowed and has six children.
Saying that getting a membership to the billionaire wives' club is no easy feat, Forbes said, "Today, there are just 110 eligible 10-figure bachelors, including divorced men, in the world."