The Rom-Commers by Katherine Center

She's rewriting his love story. But can she rewrite her own? Emma has big dreams, though she hasn't let herself think about them in years. Until her big break comes along: the chance to re-write a screenplay with her hero, Charlie-freaking-Yates! Even better: it's a rom-com - Emma's dream come true. Charlie is a Hollywood legend. He's also, as it turns out, kind of a jerk. He's written the worst rom-com Emma's ever read - and it turns out Charlie doesn't believe in love at all... But Emma's not going down without a fight. To help Charlie write the perfect rom-com, she needs to make him understand true romance. But the more she tries to teach him about love, the more real it all starts to seem. This book is available in paperback.