I'd think that even a humongous star like Jennifer Lopez gets performance jitters on occasion, especially when she's about to sing for the biggest audience of her career.

She may have looked the epitome of confidence before stepping on stage at Super Bowl LIV Sunday night in Miami. But it's clear from this behind-the-scenes video on her YouTube channel that even JLo needed a moment to psyche herself up. She's shadowboxing like a prize fighter about the step into the ring.

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