The Irish singer tied the knot with her short-time boyfriend on her 45th birthday in Las Vegas -- and 16 days later, she and Herridge were calling it quits. In a blog post on her official site, O'Connor announced the split ahead of an impending media leak of the info. "From the moment myself and my husband got together not long ago, there was intense pressure placed upon him by certain people in his life, not to be involved with me," she wrote 18 days after her Dec. 8, 2011 wedding. Story

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Celebrity marriages that didn’t last long

The Irish singer tied the knot with her short-time boyfriend on her 45th birthday in Las Vegas -- and 16 days later, she and Herridge were calling it quits. In a blog post on her official site, O’Connor announced the split ahead of an impending media leak of the info. “From the moment myself and my husband got together not long ago, there was intense pressure placed upon him by certain people in his life, not to be involved with me,” she wrote 18 days after her Dec. 8, 2011 wedding. Story (Matt Sayles / Associated Press)

Kim Kardashian and New Jersey Nets forward Kris Humphries arrive on the red carpet of the Kardashian Kollection launch party in Hollywood. They married Aug. 20; Kardashian filed for divorce Oct. 31. (Jason Merritt/Getty Images)

Nicolas Cage and Lisa Marie Presley were married on Aug. 10, 2002, and filed for divorce three months later on Nov. 25, 2002. (Mark J. Terrill / Associated Press)