Demi Moore, Ashton Kutcher Divorce: 2011's Biggest Breakups

Although we hoped that Demi Moore and Ashton Kutcher would make it past the cheating rumors that have recently plagued their marriage, it appears that finally, enough is enough -- Demi Moore has filed for divorce.

So what is it about Hollywood that has so many relationships going up in smoke? Is it the constant media attention, the temptations of their bold and beautiful colleagues or the simple fact that things just don't work out sometimes? Although the details surrounding the demise of Kutcher and Moore's relationship have yet to emerge, we can only imagine what led to the actress' third failed marriage -- or "Two and a Half Marriages," if you take Kutcher's age into account.

All we know is that, in Hollywoodland, red-carpet smiles don't always tell the whole story. Check out the biggest celebrity breakups of 2011.