Sienna Miller

Summer is right around the bend, which (among many things) means it's time to pack away your thick, chunky sweaters in lieu of light, airier pieces. But before you flip your closet, feast your eyes on the stars who have already started showing off their warm-weather style. There was Olivia Wilde, who was effortless in breezy orange pants, and Zoe Saldana, who looked sweet in a dusty rose Dolce & Gabbana top. On a more casual note, Julianne Hough made a serious case for the little denim dress. For even more inspiration, head inside to see all the celebrities showing off their spotlight-worthy style.

Sienna Miller knows how to start (and own) a trend — boho chic, anyone? — but her latest turn toward a more feminine fit-and-flare silhouette is something she has actually loved for years. While Miller's long-sleeved, light blue Matthew Williamson box-pleat dress may be the most recent example of her penchant for the girlier style, she has also stepped out in Topshop, Valentino, and Twenty8Twelve iterations. And it's not hard to see why she loves a fit-and-flare dress — and why, if you haven't converted yet, it's a really flattering choice for most body types. By cinching the smallest part of your waist and letting the skirt flare out over the hips, it creates an illusion of a bombshell-like figure. And for those of you who aren't after a totally body-con fit, this route touches on something halfway to formfitting. All the proof you need, according to Sienna Miller, is right here.

Sienna Miller donned a Matthew Williamson dress and joined her sister, Savannah Miller, to attend the 2013 BAFTA TV Awards in London yesterday. She was nominated for the leading actress award for her role in The Girl but ultimately lost out to actress Sheridan Smith, who won for her role in Mrs Biggs. Sienna has had a busy week, which started with her attending the 2013 Met Gala last Monday alongside Tom Sturridge and friends Cara Delevingne and Kristen Stewart. Sienna and Cara raised some eyebrows when the model posted a photo of herself kissing Sienna at the Met Gala on Instagram. However, Sienna insisted at the BAFTA TV Awards that the kiss was innocent. She said, "I did not snog Cara! She is like my little sister. In fact she kissed me."

Don't forget to vote for your favorite celebrities in our POPSUGAR 100 bracket! You may even get a chance to win a Victoria Beckham handbag.

Thanks to this year's Met Gala theme, Punk: Chaos to Couture, we are now trying to add some majorly tough pieces to our own wardrobes. And we have famous partygoers like Sienna Miller, Cara Delevingne, Cameron Diaz, and Gisele Bündchen as our styling inspiration. All these ladies incorporated spiked accessories into their Met Gala look — and their ensembles were that much more authentic because of it. If you too have spikes on the brain, click on to shop 22 of our favorite pieces, including bags, shoes, jewels, headbands, and belts.

Kristen Stewart pulled out a showstopping look when she attended the 2013 Costume Institute Benefit at the Metropolitan Museum of Art in NYC on Monday while wearing a Stella McCartney jumpsuit. Although her boyfriend, Robert Pattinson, didn't join her on the red carpet, she did attend the event with designer Stella and Cameron Diaz by her side. Kristen has attended previous Met Gala parties, and this year's exhibit, Punk: Chaos to Couture, is a fitting one for the famously nonconformist actress. She kept the fun coming through the night as she made her grand exit with pals Sienna Miller and Tom Sturridge.

Be sure to vote on Kristen's red carpet look in our 2013 Met Gala fashion polls.

Tom Sturridge and Sienna Miller got into the Costume Institute Benefit's punk theme as they hit the red carpet together at the Metropolitan Museum of Art in NYC on Monday night. Sienna covered up a white Burberry gown with a studded leather jacket by the same designer and even sported studs in her hair and on her ears. Tom, meanwhile, covered the safety-pin angle with pins holding together his shirt and adorning his hat. When she wasn't busy posing with her man, Sienna met up with model pal Cara Delevingne, who was also outfitted in Burberry. What do you think of their looks? Make sure to vote on your Met Gala fashion and beauty favorites!