Lourdes Ciccone Leon, the eldest of singer Madonna's four children, has enrolled at her mother's alma mater, the University of Michigan. The Detroit Free Press said the 17-year-old has appeared in the Ann Arbor college's student directory as an undergraduate in the U-M School of Music, Theatre & Dance. Madonna, 55, posted an Instagram photo Tuesday of the college's merchandise store, The M Den, captioned, "I think I'll stop in here!" Madonna left U-M after two years to begin her career. Lourdes is her daughter with dancer Carlos Leon.