Wedding bells are ringing for Britney Spears ... According to sources, Spears wore a gown by famed fashion house Versace and walked down the aisle to Elvis Presley's "Can't Help Falling in Love." ...

Spears wore a gown by famed fashion house Versace ... "It ended up being the happiest night for Britney. She wanted a fairytale wedding and she got it. Britney looked stunning," the source says.

For her wedding to Sam Asghari ... The choice to wear a custom gown by the Italian heritage brand, which is helmed by Spears’ close collaborator Donatella Versace, will come as no great surprise ...