Keira Knightley Repurposes Her Wedding Dress

The actress recycled the dress for a stroll down the red carpet.
3:00 | 12/05/13

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Transcript for Keira Knightley Repurposes Her Wedding Dress
Your wedding dress doesn't have to be a one-hit wonder, amy robach. Keira knightley surprised fashion lovers with a dress she wore years before. And she has recycled that dress again. This one's for you, amy. Reporter: On the big screen, she's a vision of beauty in movies like "anna karenina." And you love me? Yes. Reporter: And "the duchess." That's great. Reporter: But in real life, a-list actress keira knightley when she wore this knee-length chanel dress on her wedding day. A dress she wore in 2008, pairing it back then with black tights. But the third time is perhaps the charm. Dusting it off again, rocking the gown down the red carpet. This time, she added a sheer beaded overlay. When you look at the dress itself, we're not talking about a princess diana ball gown encrusted with crystals and pearls. We're talking about a simple and stunning look. Reporter: She's not the only one to wear the same dress more than once. Kate middleton repurposed this pink dress in 2012. Wearing it 2 times in 11 days. And lady obama is a fan of this colorful frock. But is recycling your wedding dress a fashion faux pas or not? Proceed with caution. Make sure it still fits you. And hopefully, it's still in style. Sometimes it takes a while for that garment to look current again. Reporter: A few tips from this vintage gown guru. Never wear the dress the same way twice. Don't wear it in front of a similar group of people. And try modifying the length or removing the sleeves. I hope she inspires other women to be confident in recycling their clothing. Especially clothing worn on memorable moments in their lives. Reporter: For "good morning america," abbie boudreau, abc news, los angeles.

This transcript has been automatically generated and may not be 100% accurate.

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