Kate Middleton celebrated engagement with her girlfriends

Kate Middleton celebrated her engagement to Britain’s Prince William by throwing a huge party for herself and her girlfriends, according to a tabloid report.

Sources say the bash — which took place at Clarence House earlier this month — went on into the early hours. Kate was joined by 12 of her closet pals.

William and Kate plan to tie the knot in April next year.

Recent reports claimed the nuptials will cost the British taxpayer around $20m.

“When all is said and done, this wedding will likely cost the British taxpayers over $20 million,” a source said.

“It will be the biggest wedding of all time, even bigger than William’s mum, Diana’s — and the price will be bigger, too.

“You really can’t compare this wedding to any other celebrity’s.

“The only other couple in the world that might even come close is if Brad Pitt and Angelina Jolie got married, but even then this will be bigger.”