Gwen Stefani got into the Costume Institute Benefit's punk theme in a custom look by Maison Martin Margiela tonight. The No Doubt singer had her husband, Gavin Rossdale, on her arm for the festivities. Gwen's cutout creation was designed specifically for her to wear to the annual fashion event, which celebrates the Metropolitan Museum of Art's Punk: Chaos to Couture exhibit. Gwen got the stylish fun started on Saturday night, when she attended a special screening of The Great Gatsby alongside Katy Perry, Emma Roberts, Leonardo DiCaprio, and Carey Mulligan. Gwen may be back to mingling with Carey, Emma, and Katy tonight, since they are also on the list of Met Gala attendees — let us know whose look is your favorite in our Met Gala fashion and beauty polls!