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Rex Features
The 26-year-old and her fiancé Cash Warren announced that they were expecting their first baby last December but doctors have now discovered two heartbeats.
A friend told The National Enquirer: "Knowing that she's going to have twins has literally turned Jessica's life upside down. She and Cash have had to scrap their plans for a one-baby nursery and start all over again."
The source added that the couple were still deliberating whether to find out the sex of their babies in advance or wait until the birth, which is scheduled for June 8.
Jennifer Lopez has reportedly checked into hospital in preparation for the birth of a twin boy and girl, while Angelina Jolie and Brad Pitt are also rumoured to be expecting two babies.
Julia Roberts and Desperate Housewives star Marcia Cross are also mums to twins.
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