Sophie Kinsella can do no wrong when it comes to writing romance with hilariously outlandish scenarios. If you love Confessions of a Shopaholic (the book series or the 2009 movie based on the first book), she has plenty of standalone rom-com books that would all make highly entertaining movies. The Undomestic Goddess ($8) is an oldie but goodie, and it stands out to me specifically because it's set in the English countryside, where Samantha accidentally finds herself after running away from London and the prestigious law firm where she works. At a beautiful country estate, she's mistaken for the new housekeeper and decides to go with it, never mind the fact that she has zero domestic skills.
This book has it all: some truly slapstick moments, a sweet romance with the hot gardener, and even a tiny bit of corporate scandal.