Jessica Alba is reportedly set to give birth to twins on June 8.
The pregnant 'Fantastic Four' actress and fiance Cash Warren were delighted to discover they will be welcoming more than one baby this summer.
The source said: "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."
Jessica - who has been keeping up her exercise and healthy eating routine during the pregnancy - is also said to be determined not to find out the sex of her babies.
The source added: "Cash and Jessica aren't sure whether they want to know the sex of the babies now or wait to be surprised when Jess gives birth on June 8."
The 26-year-old star isn't the only celebrity expecting two bundles of joy.
Jennifer Lopez has reportedly checked into Long Island's North Shore University Hospital ready to give birth to a twin boy and girl - her first children with husband Marc Anthony. Angelina Jolie and her partner Brad Pitt are also said to be getting ready for the arrival of twins.
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