The Brooklyn prosecutor caught having an affair with an NYPD cop accused of raping a handcuffed teen ducked a reporter Tuesday — a day after the “intimate relationship” came to light.

Assistant District Attorney Nicole Manini did an about-face about 7:40 a.m. after she stepped out of her Staten Island home in Rosebank and saw a waiting reporter.

Moments later, Manini, wearing pink headphones, emerged from her home and quickly walked past the reporter with her head down, ignoring questions about her affair with former Detective Richard Hall.

The 34-year-old prosecutor bought a pack of Marlboro Lights from a nearby deli before she hopped on a city bus headed toward the Staten Island Ferry.

Manini is under investigation for potentially violating professional conduct rules for New York lawyers, sources told The Post.

Her relationship with Hall, 33, was uncovered when investigators with her office reviewed Hall’s cellphone records as part of the rape case, sources said.

The calls began before the alleged Sept. 15 rape and continued afterward, according to sources.

Hall and his former partner ex-Detective Eddie Martins are accused in a 50-count indictment of raping and sexually abusing an 18-year-old woman inside an NYPD van after she was picked up in a Brooklyn park.