Tammy Morris said she frolicked with the 30-year-old actor and three other lapdancers after he picked them up in an exotic nightclub.
“It’s a night I’ll never forget and I’m sure one he’ll want to forget,” said Miss Morris, 29.
“He had this little boy look on his face.”
Twice- divorced Miss Lopez dumped the star of Pearl Harbor and called off their wedding after the “humiliating” revelations.
Just a week before, he spent more than a million dollars on the singer-turned-actress’s 33rd birthday, splashing out on a Rolls-Royce, diamond ring and a surprise party.
Miss Morris also told how Affleck gave the strippers large tips and told them: “Keep this just between us.”
She said he came into Brandi’s Exotic Nightclub in Vancouver, where he is making a film, and met a group of friends, the actor Christian Slater, his wife Ryan and actress Tara Reid.
Affleck then went into a private booth with four dancers, including Miss Morris, where she said he kissed her while “his hands were moving all over my body”.
He did the same with another dancer called Felicia in scenes which were being watched by security staff on a monitor.
Miss Morris told the National Enquirer magazine how Slater then invited them all back to his house where Affleck continued their night of fun.
“One of the girls removed his shirt,” she said.
“His hands were all over two girls at the same time.”
Affleck and Miss Lopez later had a series of heated phone calls but have not been seen together since the allegations emerged.
Miss Lopez, who is also working in Canada in the city of Winnipeg, has taken off her engagement ring and told friends the romance is over.
“It’s over. He’s made me a laughing stock,” she told one.
Her family have also told her that if the wedding does take place, they will not attend.
Some friends believe the couple could still marry later this year, however.
“I spoke with Jennifer and she was crying throughout the conversation,” said one.
“This must be killing her but she’ll get past it. There’ll be a wedding.”
Miss Lopez’s ex-husband Cris Judd, 33, is far from sympathetic.
The dancer, who was still married to Miss Lopez when she started her romance with Affleck, told a friend: “Jen is getting back what she gave.
“It’s bad karma coming back at her. She’s getting a taste of her own medicine.
“I hate to see her hurt, but I was devastated when I found out about her and Ben, and now she knows how it feels.
“It’s payback time for Jennifer and I guess, in a way, she is getting what she deserves.”
Judd was given a £9million divorce settlement in January at the end of the couple’s eight-month marriage.
Miss Lopez’s first marriage to Cuban waiter Ojani Noa lasted only a year.
She then had a volatile two-year relationship with rap artist Puff Daddy before meeting Judd.
by NICOLE LAMPERT, Daily Mail