Star Prince by Susan Grant

A galactic crown prince who’s sworn to uphold the rules, a runaway princess who’s hell-bent on breaking them. Now they’re stuck together on the same small starship, and it’s up to them to stop a war. A forbidden love, friends to lovers, sci-fi alien romance.

Crown Prince Ian Hamilton fights to stay one step ahead of the schemers who don’t want an Earth guy in line for the galactic throne. A mission critical to galactic peace forces him to hire a cute but tough pixie of a pilot he can’t help falling for–until he discovers she is on the run from the very laws he pledged to uphold.
Princess Tee’ah Dar has everything except freedom. After learning to fly starships in secret, she flees the stifling rules of the palace for the wild frontier, and promptly gets hired by a man from Earth. Her thrilling new life threatens to crash and burn when she learns her sexy employer is the one man she needed to avoid. Only one problem–her heart may already be past the point of no return.

But dark forces are on their trail and closing in fast. Soon, one Earth-born Harley riding prince, his rebellious alien princess pilot, and their crew of endearing misfits may be all that stands between the galaxy and all-out war.