Kinsella was born in London in 1969, and studied music at New College, Oxford, before switching to philosophy, politics and economics.
She wrote her first novel, The Tennis Party, aged 24 under her married name Madeleine Wickham, while working as a financial journalist.
"My overriding concern was that I didn't write the autobiographical first novel," she told the Guardian in 2012. "I was so, so determined not to write about a 24-year-old journalist.
"It was going to have male characters, and middle-aged people, so I could say, look, I'm not just writing about my life, I'm a real author."
The book was acclaimed by critics and became a top 10 bestseller. She released six further novels as Madeleine Wickham.
Five years later, writing as Sophie Kinsella, she published The Secret Dreamworld of a Shopaholic - also known as Confessions of a Shopaholic.
It introduced readers to Becky Bloomwood, a financial journalist who is a serial shopper and hopeless when it comes to her own finances, often buying new clothes or shoes on her credit card rather than saving her money.
"I thought, wait a minute, shopping has become the national pastime, and nobody has written about it," Kinsella said of her best-selling series.
The first two novels in the series were adapted for the 2009 film Confessions of a Shopaholic, starring Isla Fisher.