Queen's New Year Secret by Maisey Yates

Kidnapped by her king!  

As the clock strikes twelve on New Year's Eve, the fairy tale is over for all of Petras when Queen Tabitha — refusing to live in a loveless marriage — asks her husband for a divorce. But anger erupts into passion, and when Tabitha flees the palace she's carrying King Kairos's heir! 

Discovering her secret, Kairos kidnaps his wife. Against the backdrop of his secluded island paradise, he proves there's no escaping his royal reach. He will use the desire that's gone unsated between them for too long to ensure his wife returns to his side.