Justin Bieber Covers John Mayer, Britney Spears Spooked on X Factor, and More Viral Videos!

In this week’s batch of star-studded videos shared on social media, Justin Bieber serenades a member of his team with a John Mayer hit, Jennifer Aniston sports a baby bump, and Britney Spears gets so spooked she spits on Demi Lovato! Check out all the clips in today’s PopSugar Rush. Subscribe to PopSugarTV! www.youtube.com Visit our website for more celebrity and entertainment news! www.popsugar.com Are we friends yet? Join us on Facebook! https Get the latest updates via Twitter! twitter.com