babe in the woods - Either a clueless newbie or a hot chick hiding in the forest

Either a clueless newbie or a hot chick hiding in the forest, usually both.

'I saw a girl in the woods. She looked like a model. She also didn't know what a tree was.'

'He said he found a babe in the woods. She didn't know what the internet was.'

'She was so pretty I forgot she had no idea what a phone was.'