School shooting in Connecticut: Celebrities such as Kim Kardashian react on Twitter

10 of 21: Justin Bieber Tweeted this in response to the deadly Connecticut school shooting on Dec. 14, 2012:

'Heard about what happened in CT, my prayers go out to all those suffering in this tragedy. it's just wrong. Everyone please pray for them.'

(Pictured: Justin Bieber appears in a photo from the Billboard Music Awards on May 20, 2012.) (ABC Photo)