Sir Richard tweeted: “Great to hear @justinbieber & @scooterbraun (Bieber’s manager) are latest @virgingalactic future astronauts. Congrats, see you up there!”
Bieber retweeted the message and then a few hours later tweeted to the Virgin boss: “let’s shoot a music video in SPACE!! #nextLEVEL.”
Wannabe space tourists who have signed up to the mission will pay $200,000 (£128,000) to take off from a “spaceport” in New Mexico.
Actors Ashton Kutcher and Leonardo DiCaprio are among those reportedly set to board a future Virgin Galactic flight which will fly them 62 miles above the Earth.