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We know of at least four incarnations:

We know River Song is the last incarnation as she loses her regenerative ability soon after that incarnation is born, and we see her die in "Forest of the Dead", though it could be argued that her data clone version housed in the CAL supercomputer counts as an additional incarnation. We do not know if she regenerated between her first and "young girl" incarnations (as noted, she is perfectly aware of regeneration at the time of her change, meaning she's done it before). We do not see her change into Mels so it is not known how many incarnations may have existed in-between. Given that "young girl" regenerates decades before Mels becomes Amy and Rory's friend, other incarnations are possible, however they have never been chronicled.