The tragic shooting at Sandy Hook Elementary School in Newtown, Connecticut, last week has prompted many to come forward in support of changes to gun laws in America, and now celebrities are getting in on the cause, too. Gwyneth Paltrow, Jennifer Aniston, Beyoncé, Reese Witherspoon, Jon Hamm, Kate Hudson, Elizabeth Banks, and many others joined together to create a PSA demanding a plan to prevent further violence. Watch now to see all the stars getting involved.
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