The Roswell star is due to give birth to her first child any day now, suggesting that the full-frontal photo, in which she is not pregnant, was taken some time ago.
In the photo, Shiri is seen standing in front of a bath tub and biting down on her bottom lip.
Glancing downwards, the 34-year-old rests one hand on a sink and uses the other to hold her camera phone up to the mirror.
While nude celebrity photographs often go viral, Shiri’s failed to cause much of a fanfare.
Some speculated that the leak was a publicity stunt, given its closeness to the air date of her much talked about Girls episode – the second of a three-episode arc.
After the airing of On All Fours, questions were raised as to whether a sex scene between Shiri’s character Natalia and the character of Adam was in fact intended as a rape scene.
Others believed that given the graphic nature of that particular scene, there was little left to the imagination ahead of the photo hitting the internet.
Earlier this month Shiri tweeted a photo of her heavily pregnant self on the beach.
The actress caught some rays on the shores of Los Angeles in a blue triangle string bikini that was nearly unseen as it wrapped around her burgeoning belly