Since Virgin billionaire and mogul Richard Branson started accepting reservations for commercial space flights on Virgin Galactic, celebrities have been slapping down their cash to snag a ticket -- and the most recent one to do so is Justin Bieber.

(Yes, we hear some of you hoping he won't come back. Calm down.)

Justin previously toyed with an idea of doing a concert in space, which NASA seemed to be totally cool with.

Other celebs to have tickets on Virgin Galactic include Russell Brand, Leonardo DiCaprio, Ashton Kutcher, and Kate Winslet -- who was gifted a ticket as a honeymoon gift when she married Branson's nephew.