John Mellencamp

One week after John Mellencamp publicly split from his wife -- the rock legend and maybe-GF Meg Ryan hit a local market in NYC yesterday ... for a his-and-hers grocery run. The couple has reportedly been dating on the down low for the past couple of weeks -- even spending some QT together on…

John Mellencamp is ending his marriage of 20 years. John and his wife, Elaine Mellencamp, a model, have split, although his rep isn't saying if they've filed divorce papers yet. The couple says they "are proud of their 20 years together and are very happy with their accomplishments both as parents…