Prince Harry -- Having a Hookah Good Time in Abu Dhabi

If you're the Royal Family, these photos can be viewed two ways ...

Glass half empty: Prince Harry is partying his face off in Abu Dhabi, spotted by Clickstarpics last week on a yacht smoking a hookah.

Glass half full: He kept his clothes on.

Harry has been having himself a good time the last few days -- he's in town for the Grand Prix -- and even snapped a selfie with Tyrese, who posted the photo and wrote, "Prince Harry.... #AbuDhabiNights Oh what a night!!!!!! He asked me for a selfie with me on HIS PHONE!!!!!!"

"Fast & Furious 8" perhaps?