Gwyneth Paltrow continued her string of red carpet wins at Monday's Costume Institute Benefit, wearing a bold pink gown with a sheer panel from Valentino to escort the designer himself down the famous red carpet. Gwyneth isn't known for indulging in the punk style being celebrated in the the Metropolitan Museum of Art's new Punk: Chaos to Couture exhibit, but she did dress a bit edgier than usual for the occasion. Gwyneth is no stranger to the annual fun at the Met, having also attending the ball in 2012 and 2011. This evening, like last year, she'll be able to mingle with a star-studded crowd that includes her best friend, Beyoncé Knowles. What do you make of Gwyneth's look this evening? Let us know by weighing in on all of our Met Gala fashion polls.

Allison Williams returned to the Met Gala this evening! After attending last year in a pink Ralph Lauren column, she arrived for tonight's 2013 Costume Institute Benefit at the Metropolitan Museum of Art in a sheer gown by Joseph Altuzarra. Allison is best known for her role as the ladylike Marnie on HBO's Girls, but tonight, she loosened things up with her variation on the Met Gala theme, Punk: Chaos to Couture. What do you think of Allison's ensemble? Make sure to vote in all of our Met Gala fashion and beauty polls!

Julianne Hough broke out her finest Topshop attire to hit the red carpet at tonight's Costume Institute Benefit in NYC with friend Nina Dobrev. She was on hand at the Metropolitan Museum of Art to celebrate the Manhattan institution's new Punk: From Chaos to Couture exhibit from the Costume Institute. Julianne and a pregnant Jamie King both had the honor of representing Topshop at the 2013 gala. Julianne's been able to fit in other Big Apple fun during her stay in town for the Met Gala — last night, she was among the many stars at Justin Timberlake's Cinco de Mayo show.

What do you think of Julianne's ensemble tonight? Weigh in on her look and many more in our fashion and beauty polls!

Justin Timberlake welcomed his celebrity pals to a special show at NYC's Roseland Ballroom last night. The performance, which was organized to celebrate his new deal with MasterCard and billed as one of the credit card's "Priceless" events, brought out JT's SNL pals Andy Samberg and Jason Sudeikis. Justin's wife, Jessica Biel, was also in the wings cheering on her husband. Andy and Jason had their ladies too — they brought their respective fiancées, Joanna Newsom and Olivia Wilde. Also out for the performance were Julianne Hough, Uma Thurman, and Brooke Shields.

The Cinco de Mayo show gave Justin a chance to perform music from his latest album, The 20/20 Experience, which he recently announced will be followed up by The 20/20 Experience Part 2 in September. He sang plenty of his old songs too, from "Like I Love You" to "Cry Me a River" and "Senorita." Justin joked with the crowd, with quips like, "You're at an eight and a half. If you be honest with me, I'll be honest with you." He also asked, "Is anybody drunk yet?" After hearing some cheers, he added, "Good for you!" His frequent collaborator Timbaland emerged toward the end for a rendition of "SexyBack." It seems Justin had as great a time as the fans. He tweeted last night, "Thank you NYC and Roseland Ballroom! Had so much fun tonight. Lets do it again soon."

Carey Mulligan, wearing Lanvin, joined Leonardo DiCaprio to show their new film, The Great Gatsby, to a star-studded crowd in NYC last night. Katy Perry, Gwen Stefani, David Schwimmer, and Emma Roberts turned out to see the Baz Luhrmann-directed version of F. Scott Fitzgerald's classic novel. The celebs retired to the Top of the Standard for the afterparty. Many may return to the Standard's top-floor bar this evening, too — it's a popular spot for post-Met Gala bashes!

Carey and Leo mingled with famous fans of their film following a big week. They attended the NYC premiere Wednesday at Lincoln Center along with costars Tobey Maguire and Isla Fisher. The coming days will bring more fun. They're expected on the Croisette in Cannes to screen their film, which will open the city's 2013 film festival.

Keira Knightley married James Righton Saturday in France! The couple, engaged for a year, arrived in Nice last week to prep for their big day. On Saturday morning, they wed in the small French town of Mazan at the town hall with just a small group of family and friends there to witness. Later that evening, they hosted a party at Keira's family's farmhouse in Provence.

Keira wore a short dress, paired with a chic jacket, for the nuptials. In fact, Keira's Chanel dress was first seen on her in 2008! She also donned a chic Chanel jacket and flats. She polished off the look with a headpiece made of flowers. Congrats to Keira and James!

Keira Knightley gave her fiancé, James Righton, a big kiss Monday when she picked him up from the airport in Nice with her mom, Sharman Macdonald. Earlier this week, the UK press was full of reports that Keira and James are getting married this weekend in the South of France. If the stories are true, Keira, James, and her mother are certainly in the right spot. Additional rumors suggest that Keira, a longtime face of Chanel, is having Karl Lagerfeld design her wedding dress.

Keira and James have been together for two years and got engaged last May. While making the press rounds for her film Anna Karenina, Keira spoke about her wedding plans, saying, "I could have six fake weddings. God, that would be expensive. We're not really big-wedding types. I don't need to have all that."

Kate Moss was the life of the party in London last night! Along with her husband, Jamie Hince, mom Linda Moss, and friends like Stella McCartney and Rhys Ifans, Kate put on her finest '80s gear to mark the 50th birthday of their pal Fran Cutler at the Groucho Club. Fran, a PR executive, has been friends with Kate for years, and their many mutual friends helped pull off the surprise bash, which included many unique moments, from a This-Is-Your-Life-style presentation from Rhys and a set from Rita Ora.

Rita was there with her BFF Cara Delevingne. 20-year-old Cara and 22-year-old Rita's social circles have overlapped with Kate's now that Rita is romantically linked to Kate's good friend Dave Gardner, who's also close with David Beckham. Rita and Cara both dressed up for the period theme, though Kate topped them all by pulling out a second ensemble for the afterparty at The Box.