A Kiss is Just a Kiss by Melinda Curtis

Kitty Summer has a wedding to stop. She’s sure the groom doesn’t love her sister, but how can she prove it? By testing his fidelity with one very public kiss, of course.

That one kiss leaves Kitty stranded in Florida without her purse or cell phone and with her dotty grandmother and one jilted groom, aka Beck O’Brien. With only her bridesmaid dress to her name, Kitty needs Beck to help her get Granny back to Atlanta. And Beck needs Kitty to help him locate his bride so he can win her back. But the closer they come to finding Maggie, the more Beck wonders if a kiss is just a kiss.