Lindsay Lohan flashed her naked bits to the boys as a way of passing the time at Malibu’s Promises Rehab Facility.

According to a report featured in the National Enquirer: “Lindsay was howling with laughter as she told all her friends, including Bruce Willis’ daughter Rumer. They were all giggling too and their eyes were popping out.”

“Lindsay said, ‘I drove them all mad wandering around completely naked. They kept telling me to quit, but it was so much fun to tease all those boys. I just couldn’t stop it!’ ”