It's actually the third time the actress, 28, has stepped out in the dress. She first wore it to a British Academy of Film and Television Arts (BAFTA) event in 2008.
On Tuesday, Knightley slightly changed the look of the dress by adding a sheer, beaded overlay on top.
Knightley recently told Britain's HELLO! Magazine she love being married: "It's ...
A rep for the 44-year-old actor confirmed the news.
The couple announced their engagement in February and went to the Coral Gables District Court to get their marriage license when they spontaneously decided to get hitched. Perhaps they were inspired by Kristen Bell and Dax Shepherd?
This is Slater's second marriage. He and ex-wife Ryan Haddon divorced in 2006. They have two children, Jaden Christopher, 14,...