Updated Oct 13, 2015 @ 3:15 pm
Credit: Anthony Harvey/Getty Images

Last night the who’s who of the fashion world descended on London’s Saatchi Gallery to celebrate the launch of Chanel’s Mademoiselle Privé exhibition. Julianne Moore, Vanessa Paradis, and daughter Lily-Rose Depp were just a handful of the stars who joined Karl Lagerfeld to toast the opening.

The exhibition, a celebration of Coco Chanel’s original work, saw the Saatchi gallery transformed from a clinical white-walled contemporary art venue into Coco’s richly texturized and decadent world. The gallery’s minimalist white entrance had been turned into a meandering British country garden inspired by the time Coco spent in Scotland, which was created by English landscape designers Harry and David Rich, while inside visitors could wander through Coco’s favorite places brought to life via a free downloadable app—think a virtual Rue Cambon apartment and Coco’s first shop in Deauville.

Always keen to fuse the old with the new, Lagerfeld has also created a series of celebrity portraits on some of his favorite muses, including Moore, Depp, Paradis, and Rita Ora, which were shot at Mademoiselle Coco’s Paris apartment and showcase her 1932 Bijoux de Diamants jeweler collection. Moore, who arrived at the party last night in a Chanel couture pencil skirt told us "I'm having such a wonderful time wandering around looking at everything. It's the first time I've seen it all together."

Last night’s celebrations took place on the top floor of the gallery, dubbed the “Club Room,” done up for the occasion in dark plum velvet furnishings, old-fashioned slot machines emblazoned with Chanel camellias and pink lights.

Credit: Anthony Harvey/Getty Images

“It's quite a room to get together, to have everyone in one place. It's not a bad Monday night,” Lily Collins exclaimed before dashing off to greet friends like Depp and Stella Maxwell (above), who embraced with a bear hug. With Lily Allen on the decks and the mojitos flowing, it didn’t take long for everyone to get in the party mood. When it comes to conversation icebreakers, Ora admitted she had several: “I ask them what they're drinking? Or where's the toilet? Or, 'Hey do you guys have a lighter?'” While Depp thinks just saying hi works: “No one dislikes someone that is friendly.”

But it was Cara Delevingne who really captured the room’s attention. Holding Lagerfeld’s hand throughout her girlfriend St. Vincent's live performance, she only let go mid-set to jump on stage, take the mic off St. Vincent and tell off the noisy crowd. ‘'Can everyone please just be quiet! For those that want to listen to real music, sssshhhh!"