Prince in Disguise by Stephanie Kate Strohm (2017)

Dusty, her mom, and her sister are in Scotland where her sister is preparing to marry a Scottish aristocrat that she met on a reality tv show. The wedding preparations are also being filmed for a future television show. Dusty meets adorable groomsman Jamie and the sparks fly. But Jamie has a secret, of course. 

The charm in this novel is in the quippy but realistic dialogue, and in the fully realized relationships between Dusty's family, the new in-laws, and Heaven, Dusty's best friend who the producers of the show brought over from America to add a little 'color' to the show.