Shopaholic and Sister (2004) is a chick-lit novel by Sophie Kinsella, a pseudonym of Madeline Wickham. It is the fourth book in the Shopaholic series. It follows the story of Becky Brandon and her husband Luke as they return from their ten-month long honeymoon.

Madeleine Sophie Wickham, known by her pen name Sophie Kinsella, is an English author. The first two novels in her best-selling Shopaholic series, The Secret Dreamworld of a Shopaholic and Shopaholic Abroad, were adapted into the film Confessions of a Shopaholic (2009). Her books have sold over 40 million copies in more than 60 countries, and been translated into over 40 languages.