Fighting Dirty! Madonna Hires PIs To Spy On Ex Guy Ritchie & Son Rocco

Madonna's nasty custody battle with ex-husband Guy Ritchie over her estranged son Rocco is far from over! After a New York City court judge ordered the 57-year-old singer and Ritchie come up with their own custody arrangement earlier this week, RadarOnline.com has exclusively learned that Madge is ready to fight dirty.

"Madonna is really pi**ed off right now. She's said she was hoping that the judge was going to order Rocco to come back and he did not," the source explained. "She's said she was relying on the judge to do that and she feels that the system failed her."

So, according to the source, she's taking matters into her own hands.

"Madonna has hired private investigators on both her ex and her son," the source said. As RadarOnline.com previously reported, Rocco, 15, has been living with his 47-year-old father in London since December, and has refused to return home to the United States to live with the "Material Girl."

"The P.I.'s have already discovered that Rocco has few rules and regulations with his dad."

"Madonna is flipping out," the source claimed. "Rocco's father is turning a blind eye to everything that he does and he is trying to buy his affection."

"She is so incredibly angry and upset by all of this and is blaming it all on Guy," the insider told RadarOnline.com. "She is not mad at Rocco because he is just a kid. He is her son. She is furious at Guy though."

So will there ever be a conclusion to this saga? According to the source, that will come sooner than one might expect.

"Madonna has something on Guy that she is holding as her Ace card," the insider hinted. "She will get her son back."