After trying to cover up their divorce for weeks, once Madonna and Guy Ritchie went public with the news in October 2008, the mud-slinging started in earnest. She took a swipe at him at a sold-out concert in Boston, introducing the song "Miles Away, " which was inspired by her relationship with Ritchie, by quipping, "This song is for the emotionally retarded. Maybe you know some people who fall into that category. God knows I do." In November's Esquire, Ritchie fought back, calling Madonna "retarded" while admitting he still loves her.
5. Heather Mills vs. Paul McCartney
To vent after his volatile divorce from Heather Mills, which ended with him writing her a check for $48.7 million, Paul McCartney took to the medium he knows best. In November 2008, he released the scathing song "Nothing Too Much, Just Out of Sight," featuring the rants, "The last thing you do was to try and betray me/ In new morning light/ I'll never forget it/ And that's just outta sight," and "And you have money/ And no manners." Ouch.
6. Britney Spears vs. Kevin Federline
Though their divorce proceedings went (relatively) smoothly, Britney Spears' custody battle with Kevin Federline over the custody of their sons, Sean Preston and Jayden James, was a train wreck. The breakdown heard 'round the world happened in January 2008, when she refused to turn the boys over to Federline at the scheduled pick up time and hid with them in her home for more than four hours, until police forcibly removed her and checked her into Cedars-Sinai Medical Center.
7. Kim Basinger vs. Alec Baldwin
Like Spears and Federline, Kim Basinger and Alec Baldwin's divorce drama paled in comparison to the fireworks set off during the custody battle over their daughter, Ireland. In the sixth year of the drawn-out fight, Baldwin called the then 11-year-old Ireland for a court-approved chat, but got her voicemail. He wasn't happy. "You are a rude, thoughtless little pig," Baldwin said in the message leaked on TMZ.com in April 2007. "You have humiliated me for the last time." Baldwin apologized in statement but alleged that Basinger leaked the tape. She refuted his claim, and Baldwin temporarily lost visitation rights.
8. Whitney Houston vs. Bobby Brown
Only recently did Whitney Houston divulge the disturbing details about her divorce from Bobby Brown. "He spit on me," Houston told Oprah Winfrey in September, recounting one of her worst fights with Brown. "He spit on me. He actually spit on me. And my daughter was coming down the stairs and she saw that." Houston's response? "I took the phone and I hit him over the head with it," she told Winfrey.
9. Tricia Walsh (aka the YouTube wife) vs. Paul Smith
Her name may not be as well known as the others on this list, but her salvo is the stuff of Web 2.0 legend. British actress Tricia Walsh eviscerated her ex-husband, theater mogul Paul Smith, in a 2008 YouTube video that listed her long list of grievances. Among them -- that Smith blamed high blood pressure for his refusal to have sex, even though he kept a stash of Viagra and pornography in their home.