A "once-in-a-generation" music event circled the world Saturday, with a slew of megastars taking the stage in New York and beyond for Global Citizen Live -- 24 hours of shows across the planet to raise awareness on climate change, vaccine equality and famine.

Priyanka Chopra, Jennifer Lopez, BTS, others perform live for vaccine equity

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Priyanka Chopra, Jennifer Lopez, BTS, others perform live for vaccine equity