POSH and Becks have chosen a Spanish theme for their £500,000 World Cup party next month — in honour of their adopted country.

Women will be asked to wear “full-length and fabulous” gowns and lots of jewellery.

The pair have organised a host of other surprises to transform their Hertfordshire home Beckingham Palace for the do on May 21.

The charity event is also expected to feature flamenco dancing and other traditional Spanish performances.

Posh and Becks have fallen in love with Spain since David’s move to Real Madrid.

Gordon Ramsay is organising the food and has recently been out to Spain to seek inspiration.

Among the 400 guests are Princes William and Harry, Tom Cruise and the England team. ITV1 will show scenes from the party.