An Oklahoma teacher was arrested after concerned parents tipped off  law enforcement that the woman made their children pose in Christmas lingerie during a pizza and Christmas tree decorating party at her house. That tip led police to discover child porn on her phone.

Kimberly Crain, 47, hosted the gathering on Nov. 11 at her Shawnee, Okla., home for a handful of her students from McLoud Elementary School.

When one third grader’s parents asked her how the party was, she told them “they dressed up in bras and panties and decorated the tree and ate pizza,” according to the police report.

The girl told her parents Crain took a few pictures and started videotaping when the girls “made up a cheer dance.”

Acting on a search warrant, police seized computers and digital storage devices from Crain’s home, where they found deleted nude photos of children on her cellphone.

Crain resigned from her teaching post on Monday and was arrested on Thursday.

Crain has a history of odd behavior.  Students reported she would regularly snap photos of certain female students a few times per week while posing on their desks. She also had her students Skype with a mysterious older man named “Uncle G,” according to the police report.

McLoud Elementary School declined ABCNews.com’s request for comment.

Crain is behind bars on $1 million bail.