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

4 of 21: Demi Lovato Tweeted this in response to the deadly Connecticut school shooting on Dec. 14, 2012:

'Just in shock. WHAT is wrong with this world sometimes? Right before Christmas? My thoughts and prayers go out to Newton, CT.'

(Pictured: Demi Lovato performs live from Central Park in New York City on 'Good Morning America,' on July 6, 2012, airing on the ABC Television Network.) (ABC Photo / Donna Svennevik)