Chrissy Teigen

Want to know what a day in the life of a celebrity is like? This week, celebs took us behind the scenes with shots from parties, events, and even their workday. We stole a peek at Karlie Kloss's Victorian-inspired shoot for Moda Operandi, caught a glimpse of Mariah Carey's purple draped gown backstage at American Idol, and saw the ever-adorable Miranda Kerr taking a break (in a bikini!) from a commercial shoot. And while some where working, others were on the move — Brad Goreski was dapper on a plane back to LA, and Iza Goulart took a stroll on a sandy beach so idyllic that we were left yearning for those hot Summer days.

Click through now to see the rest of this week's cutest celebrity candids, and don't forget to follow POPSUGAR Fashion on Instagram, Facebook, and Twitter!

Between New York Fashion Week, the Grammys, and good old-fashioned model hijinks, it was a big week in the world of celebrity social media. Stars like Jessica Biel and Chrissy Teigen were on hand for music's biggest night, as was Karlie Kloss, who also shared lots of photos from her many runway appearances during Fashion Week. Fellow models Cara Delevingne and Coco Rocha were equally snap-happy — Cara goofed off with magnifying glass necklaces backstage at Tory Burch, while Coco posed with Diane von Furstenberg at the designer's Fall '13 show. Rachel Zoe congratulated Oscar de la Renta after his runway presentation, and Zac Posen talked to CNN's camera after his own big show. We also got a sweet look at good friends Kate Hudson and Stella McCartney staying close at the Elle UK Style Awards.

Click through now to see the rest of this week's cutest celebrity candids, and don't forget to follow POPSUGAR Fashion on Instagram, Facebook, and Twitter!

Kate Upton and her fellow swimsuit models celebrated their new Sports Illustrated Swimsuit Issue with a party in NYC last night. Kate wore a strapless red dress and got into the celebratory spirit by posing with her cover on the red carpet and later mingling with the other models, including Katherine Webb, inside the shindig. Chrissy Teigen wore a sexy floral frock and was joined by boyfriend John Legend, while Irina Shayk worked her stuff for photographers in a skintight purple number. Other model guests included Anne V., Cintia Dicker, and Hannah Davis.

Kate and the Sports Illustrated models have been very busy over the past few days doing press for the magazine, including appearing on the Late Show on Monday night to read off David Letterman's famous "Top Ten" list. The special issue — which hit newsstands on Tuesday — features the Sports Illustrated models in bikinis while visiting all seven continents for their various photo spreads. Notable locales include Irina posing in Spain, Anne dropping by China, and Kate braving the cold in Antarctica to work her stuff in a two-piece.

This year's Sports Illustrated Swimsuit Issue has been released — get the most of this year's edition with a guide to SI Swimsuit launch week. Kate Upton landed the cover spot for the second year in a row, this time around, flaunting her figure in a two-piece on a chilly Antarctica shoot.

Inside the issue, Kate is joined by SI Swimsuit vets Chrissy Teigen, Irina Shayk, and Anne Vyalitsyna, who each went around the world for their assignments. Chrissy showed off her bikini body in Chile, Irina got sexy in Spain, and Anne trekked China in a two-piece — click through to see their bikini shots, and make sure to check out all the Sports Illustrated bikini pictures.

Kate Upton unveiled her Sports Illustrated Swimsuit Issue cover with her fellow models on the Late Show in NYC last night. Kate wore a sexy black dress during her appearance on the show, where she and nine other swimsuit models — including Chrissy Teigen, Hannah Davis, Emily DiDonato, and Ariel Meredith — read the top 10 "questions" on the application to become a SI cover model. Some of the joke queries included "Have you ever dated Charlie Sheen?" and "Where's the strangest place you've ever found sand?" Later, Kate bundled up in a black coat to unveil a massive billboard version of her cover that was hung above the Late Show studio. This is Kate's second SI cover in a row, making her the first model to land back-to-back covers since Tyra Banks landed both the 1996 and 1997 publications.

The little black dress may be a closet staple, but at the 2013 Grammys, stars like Kelly Rowland, Carrie Underwood, and Chrissy Teigen took their LBDs to sexy new heights. Seductive cutouts, beautiful embellishments, and ladylike lace turned classic confections into envelope-pushing ensembles, and we can't get enough. Kelly flaunted her fit frame in a mesh-paneled Georges Chakra Couture gown, Carrie went for high-fashion glamour in a beaded Roberto Cavalli number, while Chrissy opted for a lace-trim two-piece ensemble, complete with a peekaboo midriff and thigh-high slit. Step inside to see which other A-listers amped up their classic black dresses with a provocative twist.

The amfAR New York Gala isn't just a haven for stunning celebrity red-carpet looks; it's also for a good cause. The annual event has become one of the city's most successful and high-profile AIDS benefits, saluting some of the biggest names in entertainment, fashion, and art. Lucky for us, it never fails to bring out a slew of stylish do-gooders — and tonight's event did not disappoint.

It was a black-and-white kind of night for heavy-hitters like Heidi Klum and Karlie Kloss (both clad in Michael Kors), Hilary Rhoda, and Chrissy Teigen, who all donned dresses in the graphic color palette. Sarah Jessica Parker went with a bright pink strapless sheath from Maison Martin Margiela, while Crystal Renn went for full-on glamour in a striking red gown. For more of the amfAR Gala style set, just click through now.

It wasn't all team colors and sports jerseys at this weekend's Super Bowl blowout in New Orleans. No, we were also treated to quite the mix of red-carpet looks, everything from sexy black minidresses — and a whole lot of leg — to more playful silhouettes in even brighter hues. Nina Dobrev supplied us with two cocktail-perfect numbers, one by Zuhair Murad and one by French Connection, while Beyoncé's Super Bowl tour de force, from the press conference to halftime fruition, provided us with three unforgettable (and ridiculously sexy) looks. Catch up on all of the weekend's most stylish celebrity fare right this way.