Iggy Azalea has a big 'ol message to Nick Young and the woman he knocked up -- EFF YOU BOTH!!
Iggy fired off the one finger salute -- which she clarified was directed at Nick and Keonna Green -- while at an airport in Australia on Wednesday ... hours after Keonna spilled her guts to US Weekly about her secret affair with the NBA star.
Iggy also claims Keonna's a liar -- saying Keonna is simply not telling the truth about an alleged attempt to contact Iggy to clue her in on the adultery.
Keonna -- who's 22 weeks preggo with Nick's child -- said she was hooking up with Nick since September ... 3 months after he proposed to Iggy.
Yeah, we kinda get why Iggy's pissed ...

It looks like 










Chelsea Manning's attorney is accusing the Army of outright lying to cover up what appears to be a suicide attempt behind bars.






Kev's been engaged to Eniko Parrish for 2 years.


