I got naked with Madonna in college — this medical crisis is no match for Madge

vogueing across the world, she was a 19-year-old dance student at the University of Michigan. For the first time, her ballet classmate and fling Peter Kentes, now 72, is sharing his story about his relationship with the “flirty” global icon — which even included a naked shower together.He is also revealing rarely-before-seen, intimate images and video of her from their college days — circa 1978 — as she currently battles a shocking health crisis that delayed her much-anticipated world tour.The photos are a far cry from the superstar image she built over her four-decade career, with her latest feat — a self-congratulatory tour nodding to her body of work, aptly called “Celebration” — disrupted by a bacterial infection and hospitalization last month.In pictures obtained by The Post, the pre-fame Madonna poses for Kentes’ camera in a red and yellow floral print dress with white crew socks and pink ballet flats.

Kentes, who still teaches dance at the university, was a 28-year-old graduate student at the time and had cast Madonna in his thesis performance. Kentes told The Post on Tuesday that he took pictures of each dancer included in his piece outside against a brick wall.In one of the images, Madonna playfully bends over, exposing her blue underwear to the sky.

“She was very willing to be photographed,” Kentes told The Post. “She was very open and very trusting.

I thought the results were great and have always thought those shots were really exceptional.“Madonna danced in front of the audience as those photographs were projected on the wall behind her during the performance,” he added. While Kentes and Madonna were friends, he also found the soon-to-be-rising star’s “energy” and “very outspoken” ways to be quite