Kate Middleton (Pic:DM)

ROYAL bride Kate Middleton was hard at work in Westminster Abbey yesterday...determined not to drop a wedding day clanger like Prince William’s mum.

Diana, just 20 when she exchanged vows 30 years ago with Prince Charles, was so nervous she famously fluffed her lines and called him Philip Charles Arthur George instead of Charles Philip Arthur George.

So it is no surprise Kate, 29, is determined to get it right when she weds William in front of 1,900 guests and TWO BILLION TV viewers worldwide.

She’s been practising over and over again the full name of her 28-year-old husband-to-be – William Arthur Philip Louis.

Yesterday Kate was joined for the wedding rehearsal by chief bridesmaid sister Pippa, 27, and best man Prince Harry, 26.

Also there to troop behind the bride-to-be and learn their steps were the six excited little bridesmaids and page boys who will attend on her in two weeks’ time.

A royal source said yesterday: “Of course Kate and William want everything to go perfectly on their big day. There will be lots of rehearsals.

“This particular one was focussed on the bridesmaids and page boys as Kate is very conscious that she wants them to be comfortable on the big day.

“She needs to be able to focus on the part she has to play instead of having to worry all the time whether they are OK.

"Two of the little bridesmaids are only three and they will undoubtedly be overwhelmed by the crowds and the splendour. By having a look round the abbey and meeting the Dean, Kate hopesthey will be more comfortable when they find themselves in the grand surroundings in two weeks’ time.”

The oldest of the girls is Margarita Armstrong-Jones, eight, daughter of Princess Margaret’s son Viscount Linley.

Then there’s Prince Edward’s daughter Lady Louise Windsor, seven, Camilla’s granddaughter Eliza Lopes, three, and William’s godchild Grace van Cutsem, also aged three.