We love Keira Knightley because she recycles. Her wedding dress. The actress attended the SeriousFun London Gala on Tuesday night wearing the same Rodarte dress she wore in May when she married Klaxons star James Righton in the South of France.

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 so exhausting to be single. When you have committed yourself to someone in an amazing way, it is very liberating. Everything becomes a lot easier."

The actress stars alongside Maroon 5 singer Adam Levine in the upcoming musical drama "Can a Song Save Your Life?"