First the 29-year old songstress cancelled her UK show because of damaged vocal cords, then she was caught up in a blowout with fellow Idols judge Mariah Carey. Now? The nutty singer gets turned away from her own album release party.

Ag sies tog.

Arriving at the Greenhouse club with her boyfriend and an entourage of 25 people at 3:30 am, Nicki was given her marching orders from the NYPD saying that the “venue was at its capacity.”

Ouch!

This is…