Never Been Worse by Morgan Elizabeth

Harper Abbott’s reputation has never been worse. The one time she tries to be spontaneous ends with her and her two best friends getting arrested for a prank gone wrong. Now, her cheating ex and his new girlfriend are on a mission to ruin her fledgling career as a fashion designer.
Wes Holden, guitarist for Altas Oaks, was pleasantly surprised to find out the charity date he was wrangled into was won by Harper, the woman he’d been quietly into for years. When he hears about the trouble she’s facing, he has the perfect solution: they should get married. His band needs a distraction in the media, and he could help her designs get more exposure.

With another leap of spontaneity, Harper agrees and is thrown into the limelight. Soon, what started as a mutually beneficial fake agreement starts to become more, and Wes finds himself working to convince her to give them a shot while Harper struggles to keep the full truth of her breakup—and its repercussions—under wraps.