Julia Roberts was hospitalized earlier this week after experiencing contractions during her pregnancy with twins, according to E! Online. Roberts, who's due date is not until early 2005, is expecting a boy and a girl. Although the contractions subsided, she remained hospitalized in Los Angeles for observation. It is likely that doctors will advise bed rest for the duration of the pregnancy.

Preterm labor is not uncommon in multiple pregnancy. Do you know the signs?