Greek heiress Athina Onassis is a cool rider in white as she competes in Qatar showjumping tournament

The last Onassis: Aristotle's granddaughter Athina is a cool rider in white as she competes in showjumping tournament

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UPDATED:

06:05 GMT, 9 April 2012

One could be forgiven for stealing glances as she walked across the track in Qatar on Saturday.

Dressed in white breeches and a ratcatcher shirt, her blonde hair pulled tautly back, Athina Onassis De Miranda undoubtedly captivated audiences at the Grand Prix of Doha.

But she was no ordinary competitor. The 27-year-old showjumper is the only surviving descendant of her grandfather, Greek shipping heir Aristotle Onassis.

Showstopper: Athina Onassis de Miranda walks the course before the Grand Prix event in Qatar on Saturday

Showstopper: Athina Onassis de Miranda walks the course before the Grand Prix event in Qatar on Saturday

Showstopper: Athina Onassis de Miranda walks the course before the Grand Prix event in Qatar on Saturday

Joined by her husband, debonair Olympic rider Alvaro de Miranda Neto, Athina was pictured walking the
course before the premiere Global Champions Tour competition.

Most remembered as the child caught
in a legal battle over the Onassis fortune, she joined a field of 44
international riders, and was every bit the standout.

Cleared: Athina jockeys grey mare AD Uceline through the course

Cleared: Athina jockeys grey mare AD Uceline through the course

In the ranks: Athina placed 28th overall at the Grand Prix of Doha, which saw riders compete for a $600,000 prize at the Al Rayyan outdoor arena

In the ranks: Athina placed 28th overall at the Grand Prix of Doha, which saw riders compete for a $600,000 prize at the Al Rayyan outdoor arena

Pairing her riding attire with a traditional navy coat and gloves, Athina jockeyed grey mare AD Uceline through the course.

She placed 28th overall at the
Grand Prix of Doha, which saw riders compete for a $600,000 prize at the
Al Rayyan outdoor arena.

Athina, the daughter of Christina
Onassis and Thierry Roussel, inherited a legacy as the granddaughter of Aristotle Onassis, the story of which lived on in America after Aristotle's marriage to Jackie Kennedy in 1968, five years following the assassination of her husband, John F Kennedy.

Athina Onassis De Miranda and her Husband Alvaro de Miranda walk the course before the Grand Prix event on Saturday

Couple: At 27, the daughter of Christina Onassis and Thierry Roussel has already been married for seven years to her Brazilian husband, Olympic rider Alvaro de Miranda Neto, right

Athina Onassis De Miranda and her Husband Alvaro de Miranda walk the course before the Grand Prix event on Saturday

Power couple: The de Mirandas walked the course together before the Grand Prix event on Saturday

At 27, the young woman once dubbed 'the richest little girl in the world' has already been married for seven years to her Brazilian husband, known as 'Doda' by friends and family.

Heiress: Athina as a baby with her mother Christina, who died in 1988 when she was just three

Heiress: Athina as a baby with her mother Christina, who died in 1988 when she was just three

The renowned showjumper,
who has been married before, was separated from his wife when Athina
joined the Brazilian show-jumping school where he trained in 2003.

The couple now live in So Paulo in an $8.6million home overlooking Ibirapuera Park.

Athina's inheritance is the subject
of much controversy as it remains unclear what is owned by her
personally, and what is owned by the Onassis Foundation, thought to be
worth $2.1b.

As a child, control of Athina's
estate was handled by five trustees selected by her mother. This is
thought to be because Christina, who died when her daughter was three,
never completely trusted Roussel.

Athina fell out with her French
father when she was young, however, and he failed to attend her wedding
to de Miranda Neto in December, 2005.

Athina, who as a 10-year-old revealed
in a handwritten will that she intended to give her fortune away, was
due to take over control of the philanthropic Onassis Foundation founded
by her grandfather Aristotle when she turned 21.

Legacy: Athina is the step-grandaughter of the late Jackie Kennedy Onassis, left, who married Greek shipping magnate Aristotle Onassis, right, in 1968

Legacy: Athina is the step-grandaughter of the late Jackie Kennedy Onassis, left, who married Greek shipping magnate Aristotle Onassis, right, in 1968

However she was blocked by the trustees, who said her connections with Greece were too tenuous.

Stelios Papadimitriou, president of
the foundation, said at the time: 'We are not going to turn Onassis
Foundation over to someone who has no connection with our culture, our
religion, our language or our shared experiences, and who never went to
college or worked a day in her life.

'She can do whatever she wants with
what she inherited from her mother, but not with Onassis's legacy to the
Greek people in memory of Alexander Onassis.'

Under the terms of her grandfather
Aristotle Onassis's will, his fortune was divided in two, with half used
to set up a charitable foundation in memory of Athina's uncle
Alexander, who was killed in a plane crash.