Celebs reacted with horror this week to twin events that captured the world's attention.
The Boston Marathon bombings triggered an outpouring of solidarity from the glitterati as they took to their Twitter accounts to help console those caught up in the tragedy that claimed three lives. The story was much the same for the Texas explosion as stars stood by those affected by the devastation.
Also making an impact this week was the 4/20 marijuana subculture and one star reminded us that every anniversary can be special.
Take our Who Tweeted That quiz and see if you can match up the celeb with their tweet: