This “Pretty Boy” is off to prison.

Gavin “Pretty Boy” Marchand, brother of rapper Foxy Brown, turned himself in at a Manhattan courthouse today, and will begin an at least two-and-a-half-year prison stint for a pair of credit card ID thefts.

Marchand, 36, had been busted last summer for using bogus cards linked to actual victim accounts to buy $8,000 in designer duds at the Hermes store on Madison Ave. and pay a five-figure bar tab at Nikki Beach Midtown nightclub.

The high sentence — a parole board could keep him in for up to five years — was the result of his prior felony ID theft record and the weight of evidence against him, including a small stash of bogus cards featuring his photo and a stolen account number.

Marchand, who came to court alone, had at times rapped alongside his more famous sister.

“These criminal operations hurt consumers and businesses, and threaten the security of financial transactions,” Manhattan DA Cyrus Vance said after the sentencing, calling ID theft one the city’s fastest-growing crimes.