Anarchist sprays the side of a police vehicle during a demonstration against government financial cuts in London in March.
Anarchists have threatened to disrupt the big day.
But with an estimated $8 million to be spent on security provided by London's Metropolitan Police, bookmakers don't expect any unwanted guests interrupting the ceremony or royal festivities. Odds are 1-50 that there won't be a successful gatecrasher.
NEXT: First dance
Last updated April 27 2011: 10:49 AM ET
Source: Paddy Power