Aubrey O’Day is in Japan, but it seems she’s got a courthouse in Manhattan on the brain … because she appears to be throwing some major shade at her old boss at the start of his criminal trial.

The former Danity Kane singer posted a bunch of photos from her trip to Japan on Instagram, but the most interesting thing was the caption — “Your Honor…”

Aubrey seems to be referencing Diddy‘s sex trafficking trial in New York City.

As we reported … Diddy was in court Monday for the start of jury selection. He was wearing a navy sweater over a white collared shirt and told the judge he was feeling some nerves and needed to use the bathroom.

Aubrey’s been an outspoken Diddy critic over the years … applauding Cassie for leveling some serious allegations against him in a lawsuit, and celebrating when Diddy was arrested.

AOD used to be signed to Diddy’s Bad Boy record label … and she’s accused Diddy of alleged shady business practices and claimed he made unwanted sexual advances.

Aubrey’s been doing the sightseeing thing in Japan … visiting Osaka, Kyoto, Mt. Fuji and enjoying the famous cherry blossoms — but it seems Diddy’s still got her attention.

Something tells us Aubrey will have more shade to throw once opening arguments begin next week … and there figures to be some explosive testimony in the trial too.