Jay Z Magna Carta Party
Credit: Paul Zimmerman/WireImage

Jay Z could be plotting a fashion line, Kate Middleton sparks a fashion frenzy, Lena Dunham wigs out, and more.

Read on for all of today’s top style and design headlines.

It’s rumored that Jay Z engaged in “secret talks” with luxury retailer Barneys New York. Could a fashion collaboration be in the works? [WWD]

Jenny Packham’s web site crashed soon after word got out that Kate Middleton wore a dress by the designer to debut her newborn son. [Fashionista]

Lena Dunham posted a series of Instagram selfies that show her trying on several wigs, prompting speculation that her Girls character is getting a hair makeover. [Daily Mail]

Bruno Mars is collecting Instagram dance videos posted by his fans and inserting them into his “Treasure” music video. [Mashable]

Michelle Williams is the face of Louis Vuitton’s fall fashion ads. [StyleWatch]

The former Miami Beach palazzo of fashion designer Gianni Versace — where he was gunned down by Andrew Cunanan in 1997 — will be auctioned off this fall. [NYC Prowler]