This thread follows a familiar pattern elswhere online having looked it up.
- "It's Anna Pierceson"
- "No it isn't"
- "Yes it is"
- "No it isn't"
So my answer is "fuck knows" although what I will say is those who have said it is Anna Pierceson have never come up with conclusive proof so that coupled with the fact that it doesn't look like her to me (even though it's hard to tell with her eyes closed) then I would fall on the side of doubting that it is true.
But it is one of those images that has done the rounds on the internet for years.
I don't even know if WatchThatGF was a a legit site or what the history is with it. It has been excluded from the Wayback Machine which suggests something fishy was going on with it or that it was perceived to be dodgy just on its name alone.