Once again, from the news:

Police arrested and handcuffed 22-year-old Meagan McCormic Friday morning, after she reported her child missing at Christmas time, even though the baby never existed to begin with.

Miami police said McCormic had a miscarriage when she was three months pregnant. However, investigators said she pretended to carry the baby to full term in order to keep her boyfriend from breaking up with her.

Source: http://www4.wsvn.com/news/articles/local/MI107634/