They are the first stars at the Cannes Film Festival to publicly take a stand for the schoolgirls using the now world-famous hashtag on Twitter also promoted by US First Lady Michelle Obama earlier this month.
Islamist group Boko Haram abducted 276 girls in restive northern Nigeria on April 14, and while some subsequently escaped, 223 are still missing.
The kidnapping sparked global outrage and the girls' fate has since become the focus of a global campaign.
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Islamist group Boko Haram abducted 276 girls in restive northern Nigeria on April 14, and while some subsequently escaped, 223 are still missing.
The kidnapping sparked global outrage and the girls' fate has since become the focus of a global campaign.
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