Celebrity Social Media Videos For Week of Sept. 21, 2012

Video: Bieber Covers John Mayer, Britney Spears Spooked, 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.

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