Meg Ryan's got her male -- John Mellencamp -- and they're ready to take their romance public!

A day after news broke that Mellancamp, 59, and Ryan, 49, were secretly dating, the unexpected new couple were photographed together heading out to lunch in NYC.

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A source told Us Weekly that the singer and actress were first spotted together in the Big Apple in October. Ryan has even been showing up backstage to support the rocker at his concerts!

But the Sleepless in Seattle actress has nothing to do with the end of the "Hurts So Good" singer's 18-year marriage to former model Elaine Irwin Mellencamp.

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"Meg came into the picture much later," the source explains.