Singer Beyonce Knowles attends a special screening of "Beyonce Live At Roseland: The Elements of 4" at the Paris Theatre on Sunday, Nov. 20, 2011 in New York. (AP Photo/Evan Agostini)
Justin Bieber, Lady Gaga and Michelle Obama are signing on to support Beyonce.
She is working on a global campaign for World Humanitarian Day which Beyonce marked Sunday with the release of a new video for her song ‘‘I Was Here,’’ filmed at the United Nations in New York last week.
The campaign asks that on Sunday people help others through such acts as making sandwiches for the homeless or volunteering at a local charity. The goal is to share 1 billion messages of hope.
Bieber, Gaga, Obama, Rihanna, Shakira, Jay-Z, Gwyneth Paltrow, Chris Martin and others will participate.
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