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

6 of 21: Christina Applegate Tweeted this in response to the deadly Connecticut school shooting on Dec. 14, 2012:

'There are just no words. Only sorrow. We are all shedding tears today for those families.'

(Pictured: Christina Applegate and Will Arnett appear in a scene from a season 2 episode of 'Up All night' which aired in 2012.) (NBC)