Wedding Night by Sophie Kinsella

In this delightful romantic comedy, two sisters find themselves entangled in a whirlwind of love, misunderstandings, and impulsive decisions. Lottie, convinced that her boyfriend is about to propose, is left heartbroken when he doesn't, leading her to rekindle a past romance with her first love, Ben. Seizing the moment, they decide to marry immediately and head to a Greek island for their honeymoon. Meanwhile, Fliss, Lottie's protective sister, is determined to prevent what she sees as a disastrous mistake. As the sisters navigate a series of comedic mishaps and unexpected revelations, they learn about love, family, and the importance of following one's heart.