Mary-Kate Olsen

The fun wasn't over for the Met Gala 2013 attendees in NYC last night as they flocked to the Standard Hotel following the ball for the official afterparty at the Boom Boom Room. Madonna stripped out of her bum-baring Met Gala outfit and changed into a fishnet body stocking and black lacy lingerie to mingle with guests like Katy Perry, Allison Williams, and Frank Ocean. She wasn't the only star who made a costume change — Amanda Seyfried took off her gown and changed into a baggy black t-shirt to hit the dance floor with Frank. Meanwhile, Miranda Kerr met up with January Jones, Jennifer Lawrence arrived with Marion Cotillard, Gerard Butler mingled with Karolina Kurkova, andNicole Richie connected with Kirsten Dunst, and Mary-Kate Olsen snuggled with boyfriend Olivier Sarkozy. Mary-Kate and Olivier weren't the only couple at the late-night bash, as Jennifer Morrison was spotted holding hands with her Once Upon a Time costar Sebastian Stan and Kate Bosworth hugged Michael Polish. If you missed out on all the excitement last night, be sure to check out our collection of all the red carpet fashion from the 2013 Met Gala to get caught up!

Our position on the red carpet at last night's Met Gala afforded the chance to observe what really takes place on the storied red carpet! It was model, designer, and actor madness as guests headed in to celebrate the opening of the Metropolitan Museum of Art's Costume Institute exhibit Punk: Chaos to Couture.

Veteran attendees Gisele Bündchen and her husband, Tom Brady, shared a run-in with first-timer Kim Kardashian on the carpet, while a Valentino-clad Gwyneth Paltrow caught up with her good friend Jessica Seinfeld. Kristen Stewart wasn't bothered by the stars like Sarah Jessica Parker and Jessica Biel mingling outside the Metropolitan Museum of Art, though her pal Jennifer Lawrence did do a bit of socializing with her fellow Dior spokesperson Marion Cotillard.

There were many other candid moments we captured last night — in addition to seeing the best Met Gala fashion pictures, click through to see our first-person snaps!

Mary-Kate Olsen and her boyfriend, Olivier Sarkozy, were accompanied by her twin sister, Ashley Olsen, to catch a flight out of LAX yesterday. Olivier affectionately held his arm around Mary-Kate, while Ashley walked a few steps ahead as the trio made their way through the airport. The couple are no strangers to showing their affection, and just last week displayed PDA on the East Coast. Mary-Kate and Olivier kissed courtside at a New York Knicks game, which is becoming a routine sight since it was the couple's eighth cuddly time in the stands. Mary-Kate turned her focus from sports to music, though, during her West Coast stay and popped up at a secret Rolling Stones concert with Ashley over the weekend.

Johnny Depp and Amber Heard were photographed showing PDA Saturday night as they left a secret Rolling Stones show at LA's Echoplex. Johnny and Amber costarred in the 2011 film The Rum Diary but have kept any possible romance out of the spotlight until now. Amber was able to mingle with the Stones, thanks to Johnny's longtime friendship with Keith Richards. Johnny and Amber were among the 700 people who saw the Stones after the band announced the show on Twitter earlier in the afternoon.

Amber and Johnny were just two of many celebrity guests last night. Also out to see Keith, Mick Jagger, Charlie Watts, and Ron Wood do their thing were Gwen Stefani, Mary-Kate Olsen, Ashley Olsen, Owen Wilson, and Maria Shriver. Bruce Willis, who has a vacation home near Keith at Parrot Cay in Turks and Caicos, also attended with his wife, Emma Heming. Stones wives and girlfriends Patti Hansen and L'Wren Scott and 65-year-old Ron's wife of four months, 35-year-old Sally Humphreys, were there, too. The Stones got in last night's show before kicking off their "50 & Counting" world tour this Friday at LA's Staples Center.

Mary-Kate Olsen and Olivier Sarkozy showed love last night at a Knicks game at NYC's Madison Square Garden. It seems the duo can't help but indulge in PDA courtside — they've been photographed cuddling during at least eight games since last November! They're also apparently good-luck charms for the team. Last night, the Knicks beat the visiting Boston Celtics, 87-71. It was an especially important win since it was a playoff match, and now the Knicks are up 2-0 in their three-game series with the Celtics. The third game takes place Friday night in Boston.

Mary-Kate and Ashley Olsen stepped out in NYC yesterday for a business meeting. Mary-Kate wore heels for the workday after leaving her Tribeca apartment wearing flats earlier in the afternoon. The duo are back together on the East Coast after Ashley took a trip to Paris for Fashion Week last month. Her younger sister Elizabeth was also on hand for the runway fun, stopping by Louis Vuitton and chatting with Naomi Watts before the big show. Elizabeth will soon be the one in the spotlight since she'll be starring in an off-Broadway production of Romeo and Juliet. Elizabeth will play Juliet to open the Classic Stage Company's 2013/2014 season.