The Celebrity: Justin Bieber
The Social Media Blunder: Posted a photo of him mooning a cameraman on Instagram in January. Somehow, the photo of his bare behind received more than 85,000 likes.
Why It Was Such A Fail: The image of Bieber's ass will stay on the Internet forever. FOREVER! It was funny when it happened. But something tells us it won't be as hilarious in 25 years when Biebs' kids find it.
Photo Credit: Perez Hilton