The pair revealed that they used to skip classes to sneak off and smoke in a school stairwell, reported E! Online
"(We) went back and forth for a few years," they said.
In fact, the two were so close that Broderick even knew Sedgwick's mother, Patricia.
But they insisted they never got physically intimate.
During a joint appearance on 'Watch What Happens Live', host Andy Cohen asked if they had known each other "connubially", Sedgwick, who got married to Kevin Bacon in 1988, replied, "Never before I got married."
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