A substitute teacher was arrested yesterday for indecent exposure after she performed a cartwheel in a high school choir class "with According to cops, Lacey Sponsler, 34, exposed herself to students last Friday at Pawhuska High School in Pawhuska, a city about 50 miles north of Tulsa. Sponsler, seen at right, was wearing a long dress, but no underwear, "which caused her to expose herself to the students in this class," cops allege .