‘Sex addict’ Bobby Brown on being with Whitney, Madonna & Janet: new doc

As a newlywed couple, Bobby Brown and Whitney Houston sang about having “Something in Common” on their first duet in 1992.

And before his wedding to the late pop superstar on July 18, 1992, the jittery groom — who had been “drinking and smoking, sniffing” in the bathroom — discovered that the two shared even more than their hot music careers.

“I walked in and, um, saw her doing a line of coke. It was a shocker to me seeing her sniff for the first time,” he revealed in the new A&E documentary “Biography: Bobby Brown,” which premieres on Monday and Tuesday nights. “I think that was when I realized that we had more in common than I thought. I was new to it, and I guess she had been doing it for a while.”

In the four-part doc, the “My Prerogative” singer opens up about everything from his tumultuous relationship with Houston and affairs with other pop divas to his sex addiction, substance abuse and the tragic deaths of his children Bobbi Kristina and Bobby Jr.

Brown, 53, told The Post that making the documentary was a “healing” process for him. “Because of the losses I’ve gone through and me trying to get well with myself, it was therapeutic,” he said. “It was my time to clean out my closet.”

Bobby Brown evolved from New Edition’s resident bad boy to a solo superstar.

The documentary traces how Brown and four friends in the inner-city Boston neighborhood of Roxbury formed New Edition when they were kids and went on to have success with Jackson 5-esque hits such as “Candy Girl” and “Mr. Telephone Man.”

Brown was the group’s resident bad boy: He sold drugs even after their breakthrough and rebelled against their bubblegum image — which would eventually get him voted out of New Edition.

“I wanted revenge,” said Brown, who went on to become a solo superstar with new jack swing classics such as “Don’t Be Cruel” and “Every Little Step.”

With New Edition, Bobby Brown (second from left) rose up from the projects in Boston.

“Did I sleep with Madonna? We didn’t do any sleeping,” Brown said of the Material Girl.

And in those days, Brown did plenty of humpin’ around. “I believe I was a sex addict,” he said.

In fact, before Houston came along, Brown had affairs with two of the era’s other reigning pop queens: Madonna and Janet Jackson. “Did I sleep with Madonna? We didn’t do any sleeping,” he said.

Describing Jackson as “the crush of my life,” Brown said, “The reason me and Janet broke off was because she couldn’t be with a man like myself. I’m from the projects. I’m hood.”