Legendary rocker Lou Reed, who was back on stage in June just weeks after receiving a liver transplant, was rushed to a Long Island hospital yesterday morning, sources said.

The Velvet Underground founder was rushed to the emergency room at Southampton Hospital from his East Hampton home shortly before 7 a.m. following an emergency call for an adult male suffering from dehydration.

A woman who answered a phone in the unit where Reed was being treated said, “Everything’s fine.”

Reed, 71, suffered the setback 10 days after he made his first public appearance since his lifesaving transplant — at the Cannes Lions International Festival of Creativity on June 20. Reed had the surgery in Ohio in May.

In a June 20 interview, Reed made reference to his declining health.

“How could time go that quickly?” he said. “The other day, I was 19. I could fall down and get back up. Now if I fall down. you are talking about nine months of physical therapy.”