The Unhoneymooners, written by Christina Lauren, is a hilarious and charming celebrity romance book. It follows the story of Olive Torres, who reluctantly goes on her twin sister's honeymoon with Ethan Thomas, the brother of her sister's new husband. As they navigate unexpected situations and hilarious mishaps, Olive and Ethan find themselves drawn to each other. This book is filled with witty dialogue, laugh-out-loud moments, and a swoon-worthy romance.