Not-So-Perfect Princess

Description for NOT-SO-PERFECT PRINCESS by Melissa McClone:

Dutiful Princess Julianna has a secret -- she's actually happiest makeup free, sailing with the sea breeze in her hair. Her attraction to rebel prince Alejandro is instant -- but her intended is his brother, the proper but dull Enrique!

For the first time, Julianna's irresistibly tempted. Before long, she's spending her nights sailing with gorgeous Alejandro while the rest of the palace believes she's sleeping. Soon she'll have to choose -- remain the perfect princess, or follow her heart and stop sleepwalking her way through life....

Harlequin Romance #4250, July, 2011.