He pulls back, exclaiming, "Ow! That didn't feel good! I don't know why she just threw that at me."
Bieber wasn't' hurt, and stayed calm.
"It all went down at the Jingle Ball concert back in December," says celebrity website TMZ.com, "when some … concertgoer with an incredibly accurate arm fired off the water bottle while Bieber was front and center."
And, kids MTV.com, "His hair also remained intact."