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She was hardly a model Muslim before she became an ISIS suicide bomber — drinking booze, hanging out with drug dealers and posing for naked photos in a bubble bath.

Before-and-after photos of Paris terrorist Hasna Aitboulahcen, 26, show her radical transformation from a hard-partying clubgoer nicknamed “Cowgirl” into a violent Muslim extremist.

In one picture obtained by DailyMail.com, she is seen soaking nude in a tub, covered by only a necklace and bubbles.

Another shows her lounging in a tank top wearing heavy makeup while pouting at the camera.

Her brother, Youssouf Aitboulahcen, said his estranged sister preferred the Internet to Islam — and first put on a veil just a month ago.

“She was living in her own world. She was not interested in studying her religion. I never saw her open the Koran. She was permanently on her phone, looking at Facebook or WhatsApp,” Youssouf Aitboulahcen told DailyMail.com.

Neighbors told the Times of London that Aitboulahcen was considered a bad Muslim, and a female friend said she once caused a scene while wasted in a German nightclub.

“She got very drunk and sprayed tear gas around the whole place,” the pal said.

“Basically, she just got angry with a guy who was trying to chat her up and became furious.”

“I think she had a very disturbed childhood, and she had a lot of problems. She really did drink a lot,” the woman added.

Another friend, Amin Abou, 26, described her as a “party animal who loved clubbing.”

“She drank alcohol and smoked and went around with lots of different guys, She had a bad reputation. She had lot of boyfriends…” he said.

Credit: DailyMail