Disgraced former Police Commissioner Bernard Kerik appeared in court Wednesday for a second day of testimony at a perjury trial in the Bronx.

Kerik took the stand Wednesday in the case against Peter and Frank Ditommaso.

He denied having a shady business relationship with the brothers, who are accused of lying to a grand jury about lavish renovations on Kerik's Riverdale apartment.

The former police commissioner said he paid the brothers $30,000 to do the work.

Prosecutors are trying to prove the Ditomassos may have done extra work for free as part of a political favor.

This week marks the first time Kerik made a public appearance since pleading guilty in 2010 to filing false tax returns on those renovations and eight other felonies.

He's serving four years in a federal prison.