A drunk Jersey cop whose speeding car mowed down a beautiful aspiring lawyer in the Financial District last year was sentenced today to serve at least 3 and a half years prison.

Family members of Martin Abreu, a 26-year-old cop from Jersey City, broke into mournful sobs as he was led off to prison.

He’ll be eligible for parole in 3 and a half years, and will serve a maximum of ten and a half.

Abreu, was off-duty last February, when he plowed into Marilyn Huang Feng, and her hedge-fund analyst boyfriend on West Street. The couple were both 26 years old at the time, and had been walking home after a tango lesson.

“There’s not a day that goes by that I do not wish I could trade my life” for Feng’s, Abreu told the judge.

The boyfriend, Dennis Loffredo, suffered a shattered leg and the loss of “the love of his life,” said the prosecutor, William Beesch.

Feng was also treasured by her parents in China, for whom she was an only child as mandated by government policy.

“The pain of losing our only child will never go away,” the parents, who could not attend the sentencing, said in a statement Beesch read aloud.

Abreu had a blood alcohol level of .124, well above the legal limit of .08, and witnesses said he was going more than twice the speed limit.

“I just don’t understand how people do it,” Manhattan Supreme Court Justice Charles Solomon said of drunk driving, noting that this tragedy was “especially troubling because the defendant is a police officer, sworn to uphold the law.”