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"   How well do you know this week&amp;#039;s most stylish happenings? 1. What designer did Claire Danes choose for the premiere of her beau&amp;#039;s new film, Adam? 2. What fashionable first lady would&amp;#039;ve celebrated her 80th birthday this week? 3. What British department store just made its first foray into online retail? 4. What menswear label hired professional hockey player Sean Avery? 5. What&amp;#039;s the name of Eva Mendes&amp;#039; new home collection? \u2014Erin Clements Answers after the jump!  1. Zac Posen (Read our red-carpet recap here). 2. Jacqueline Kennedy Onassis (See some of the fashionable first lady&amp;#039;s most memorable looks.) 3. Browns (Read more about the store&amp;#039;s online venture.) 4. Commonwealth Utilities (Read more about Avery&amp;#039;s new gig.) 5. Vida by Eva Mendes (See what she wore to the launch.) Photo: Retna  Follow ELLE on Twitter.  "^^<http://www.w3.org/2001/XMLSchema#string>
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