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Producers had demanded all contestants must be in the UK by today.

But party-loving Yanks have refused to accept the restrictions set out in their contract.

A show source said: “Quite a few of the housemates who are flying in from America wanted to celebrate New Year’s Eve at home. They refused to agree to the flight time put forward by the production team.”

The unruly housemates, thought to include Spencer Pratt and Heidi Montag aka Speidi, will now not arrive in the UK tomorrow.

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That means they will go into hiding around 24 hours before CBB’s launch show on Tuesday night.

Production staff are said to be “in crisis” because all housemates have a string of filming commitments to complete before they enter the telly house.

These include on-camera interviews and profile shots as well as chats for CBB’s spin-off show Bit On The Side with ex-housemate Lauren Harries.

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Our source said: “Everything is going to be very last minute. This is causing a real headache for production staff. There are serious concerns things could go wrong if one of them misses their flight.”

Other US stars in the frame for the new series include Ray J, Stacy Francis and Perez Hilton.

They will be joined by Brit stars Bianca Gascoigne, Nicola McLean, Jamie O’Hara and James Jordan.

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Katie Hopkins and Stephen Bear have both rules themselves out.

And it emerged last week Danielle Armstrong has been snubbed by producers at the 11th hour.

Reports claimed she is devastated because she quit TOWIE so she could go into CBB.

Meanwhile, our source has learned Shameless actor Jody Latham has pulled out.