Billionaire Kirk Kerkorian -- My Greedy Ex-Wife is A Habitual LIAR!

Kirk Kerkorian -- the billionaire who once owned United Artists and the MGM Hotel in Vegas -- has fired back against his ex-wife who is gunning to put him under a conservatorship, calling her a serial liar motivated by unbridled greed.

Lisa Bonder had filed legal docs claiming the 95-year-old Kirk was being held hostage by people in his company and she wanted someone to step in and, at the very least, allow Kirk to re-establish a relationship with their 15-year-old daughter Kira.

Now Kirk has fired back in legal docs, saying, "The only person Lisa Bonder has ever cared about is Lisa Bonder." Kirk says Lisa is a proven liar many times over -- for starters, he notes she deceived him into believing Kira was his kid by rigging a DNA test -- he says she took the DNA from Kirk's natural child and passed it off as Kira's.

Even though Kirk's not the dad, he stepped up for benefit of Kira and agreed to pay child support, but he says it's never been enough for Lisa. Kirk had agreed to pay $50,000 a month in child support, but Lisa wanted $100,000. After Kirk agreed to pay her $100k and gave her more than $10 million to just go away, she came back and asked for $500k a month.

Kirk notes in the docs that Lisa has lied to multiple judges about what she claims are Kira's needs, only to be shut down and exposed as a liar.

Kirk believes Lisa wants a conservatorship because she thinks she can screw him out of more money with a conservator.