65 per cent of British people are set to cry when Kate Middleton and Prince William tie the knot.

The couple will marry at London's Westminster Abbey on April 29 in front of 1,900 guests and a worldwide audience of millions and according to new research by Kleenex, the emotional day may be too much for some people.

I'm kind of bummed I'm not invited to the royal wedding. My girlfriend asked me if I was invited. Well, no, but I invited them to my wedding!

Behavioural psychologist Dr Jo Hemmings said: "Many of us aren't lucky enough to know William and Kate but even so we should all be prepared to shed a few tears on the big day. Although we may not realise it, patriotism is strongly inbuilt in our psyche so the feelings of pride, joy and belonging at the Royal Wedding are likely to make us well-up."

Celebrity guests at the wedding who could shed a tear include David and Victoria Beckham, Elton John and David Furnish.

However one notable exception will be Reese Witherspoon, who revealed she invited William and Kate to her own nuptials last month in the hopes that she could attend the royal wedding.

She said: "I can't even contain my enthusiasm for the royal wedding!

"I'm kind of bummed I'm not invited to the royal wedding. My girlfriend asked me if I was invited. Well, no, but I invited them to my wedding!"