The Trouble With Christmas by Robin Daniels

Chrissy Jensen lives in a town full of Christmas fanatics. Too bad she hates everything about the holiday. Aside from her justifiable grievances, the endless barrage of displays and events is enough to make any girl gag. Nothing has ever been able to thaw her frozen yuletide heart. But when her brother brings a handsome friend home for the holiday, she starts to reconsider her contemptuous attitude. The deliciously yummy houseguest LOVES Christmas. Pretending to share his sentiment couldn’t hurt. Right?
Wrong. The sudden personality transplant doesn’t sit well with her best friend Nate. He perpetuates the deception in order to get even, which causes an agonizing dilemma. Now, Chrissy must keep up the charade—with a cheerful disposition—or risk being caught in her lie.