The hospital where Jennifer Lopez will give birth has been put on kidnap alert.

Staff at Long Island's North Shore Medical Center took part in a Code Pink security drill on Friday, which involves locking down the hospital if a baby goes missing, according to gossip website TMZ.com.

Jennifer, who is reportedly expecting twins with husband Marc Anthony, is due to give birth today.

One friend said: "Jennifer has spoken so much about how excited she is about the birth that anyone who is considering a kidnapping knows how far she would be willing to go to get her babies back.

"The hospital will be on high alert when Jennifer comes in to give birth, and have practised the Code Pink drill just in case they need to put it into practice."

A representative for the hospital confirmed they had practized the drill, but said the timing was "coincidental".

Meanwhile, Jennifer and Marc have spent a staggering $120,000 on nurseries for their unborn children.

Sources close to the couple revealed the pair have purchased English furniture, French-made cribs and 18-karat gilded trim chandeliers for the nurseries in their Bel Air and Fisher Island homes.

She can't wait to get back to her normal shape.