A 24-year-old Roxbury woman was arrested Tuesday after she was caught on tape extorting a man of $6,500 for breast implants, prosecutors said.

The victim, a lawyer, cooperated with police to set up Deborah Yi in a sting, that’s when her plan for a bigger bustline was busted, authorities said.

After her arrest, Yi said she knew what she was doing was wrong, but it was “a way to get easy money,” prosecutors said. She attempted to swindle the cash from a man who brushed her with his car Sunday in the Seaport District.

Yi was arraigned yesterday in South Boston District Court on a charge of extortion. She was released from jail on her own recognizance on the terms she report to probation once a month and stay away from the victim.

Prosecutors said the man’s extortion ordeal began Sunday when he brushed Yi, a pedestrian, with his car as he turned from Seaport Lane to Congress Street.

The driver spoke with Yi who told him she was uninjured. The man offered Yi a ride to her work, prosecutors said.

But only an hour later, Yi began threatening the man that she would pursue criminal charges or go after his law firm unless he paid her $7,000 for breast augmentation, prosecutors said.

She then called or texted the man 10 times over the next two days looking for the loot.

But the man went to state police, who began monitoring the harassing phone calls and texts, prosecutors said.

At 4 p.m. Tuesday, police looked on as the man wore an audio and video recording device when he met Yi at Liberty Wharf. The man handed Yi an envelope with $3,000 at which time she demanded another $3,500 within a day or two, prosecutors said.

Officers then pounced on Yi, who handed over the envelope filled with money during her arrest.