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She once sang about being Jenny from the block.

But 20 years earlier, Jennifer Lopez was left in the shade by the New Kids On The Block – as their backing The singer and actress was appearing on the chat show to talk about her new – and seventh – album Love?

But Leno turned the conversation around to her time as a backing dancer and that’s when he played the footage.

Taken at the 1991 American Music Awards, J-Lo can be seen dancing enthusiastically behind the five-piece boyband, who were then at the height of their fame.