Priscilla Presley, who wed the rock icon in Sin City in 1967, is preparing to open the chapel as part of Graceland Presents ELVIS: The Exhibition - The Show - The Experience at the Westgate Las Vegas Resort and Casino on 23 April (15) and she is determined to keep it classy to honour her late love - so tacky imitators will not be allowed.

She tells the Associated Press, "This is all first-class. This is not a joke. The wedding chapel is not a joke.

"Elvis had a lot of dignity. Elvis had a lot of class. He was a beautiful specimen of a man."

The permanent exhibit will be the first to feature hundreds of artefacts which have never before been seen outside Elvis' Graceland mansion in Memphis, Tennessee.

The singer performed hundreds of sold-out gigs at the Westgate location between 1969 and 1976, when it was known as the International Hotel and then the Las Vegas Hilton.

Elvis died in 1977, four years after divorcing Priscilla.