MacKenzie Bezos has pledged to give away more than half of her $37billion divorce settlement from her Amazon founder husband.

Last week, she signed The Giving Pledge which is an organization for the world's wealthiest people where they sign up to donate half or more of their fortune.

While Bill and Melissa Gates are both signed up, Jeff Bezos, the richest man in the world, is not.

In her pledge last week, MacKenzie said she had 'a disproportionate amount of money to share'.

MacKenzie Bezos was awarded $37billion in her divorce from Jeff Bezos. She is giving half of it away

MacKenzie, who is an author, wrote on her page on The Giving Pledge that she has a 'disproportionate amount of money to share'

'We each come by the gifts we have to offer by an infinite series of influences and lucky breaks we can never fully understand.

'In addition to whatever assets life has nurtured in me, I have a disproportionate amount of money to share.

'My approach to philanthropy will continue to be thoughtful. It will take time and effort and care. But I won’t wait.

'And I will keep at it until the safe is empty,' she wrote.

MaCkenzie was awarded 25 percent of her and Jeff's joint stake in Amazon when they settled their divorce.

It was less than the 50 percent she was entitled to and she gave her ex-husband voting control of her shares.

She has not spoken of their divorce other than to say that she was relieved it was settled.

Jeff Bezos, pictured with his new girlfriend Lauren Sanchez, is not part of the pledge. He is the only American in the top five richest people in the world to not be a part of it

MacKenzie has also not made a public comment on the circumstances surrounding their split.

The pair announced they had parted ways at the same time as Jeff's affair with Lauren Sanchez, a married former TV personality, was revealed.

They have not confirmed when exactly it began and if there was any cross-over between their romance kindling and their marriages ending.

Lauren was married to Hollywood mega agent Patrick Whitesell who introduced her to Bezos.

She and Jeff remain together and have recently broken cover after staying apart for months while they negotiated their divorces and reeled from the scandal they caused.

While Jeff is the only American in the world's top five richest people not to join The Giving Pledge, he has launched his own charity initiatives.

Among them is a $2million fund to help homeless and struggling families.