Possibly not a permanent tatoo.
I guess you are right. It could be a temp tattoo that Anna had on her back... but here let me type this out of my People Magazine (March 5th edition) "Mother, son and daughter survived as a family for only three short days, but Anna Nicole Smith was determined to reunite them somehow. Do for two days in December- just a few weeks after the birth of her daughter Dannielynn and the death of her son Daniel- Smith spent 20 hours at the Tattoo King parlor in the Bahamas having portraits of her children inked into her shoulders. "she kept saying she wanted to keep Daniel with her forever," says the parlor's owner, Byron Austin, whose brother tattooed an image of Smith with Daniel on her left shoulder, and another of her with Dannielynn on her right. "Next she wanted to get the baby's footprints and Daniel's gravestone," says Austin, who scheduled another session for Feb. 6. Smith missed that appointment, and just 2 days later she was dead." Wheeeeeee I can't find this on the internet anymore.
here is another story... http://www.actressarchives.com/news.php?id=3546
But I think they were very very ugly so I hope they were temp!
How does the M.E. resolve the fact that ANS allegedly took some Chloral Hydrate around 10 a.m. the morning of her death BUT everyone now knows that Chloral Hydrate can not be found in the body after about 4 minutes after taking it?