Nigel Barker.

Hosts Nigel and Cristen Barker, Russell James and Donna Karan will be at the Fourth Annual Solving Kids’ Cancer Spring Celebration this year honoring Ms. Karan’s BFF Bonnie Young and daughter Gabby Karan De Felice. The committee includes supermodel Helena Christensen, socialite Jennifer Creel, Carolina Herrera, nightlife queen Amy Sacco and photographer Kelly Klein, to name-drop a few.

583 Park Avenue, (212) 583-7200, cocktails 6:30pm, dinner 7:30pm, individual tickets $600, tables $6,000-$25,000. 

Creative Director Francisco Costa alongside Diane Kruger, Emma Stone and Amy Adams.

We love the clean lines and abstract nature of Francisco Costa’s designs for Calvin Klein Collection. Of Brazilian descent, he has an unmatchable talent for creating wearable art that is minimal and wearable—perhaps the only one who provides a Parisian level of artistic thrills in New York.

We had some time to spare before the show began—a departure from our general habit of sprinting four blocks and arriving sweaty and out of breath at the last minute. We left our seat-mates Bianca Jagger, Julie Macklowe and Kelly Klein, to name a few, to explore the front rows.

Amy Adams, Diane Kruger, Emma Stone and photographer Patrick Demarchelier were all present, but our vigilant eyes sought out someone less obvious: W Magazine’s Fashion and Style Director, Edward Enninful.

“What are some of the highlights for you?” The Observer asked.

"September is the January of fashion," said Edward Enniful, who was flanked by Hollywood's hottest.

“Oh my goodness, there have been a couple of really great shows. I really enjoyed Proenza [Schouler]. I really enjoyed Rodarte, Marc Jacobs,” he replied, browsing the endless catalog of styles he had presumably witnessed in the past week; an unbearable fashion overload, it seems.

“How have you enjoyed W and growing there?” we carried on.

“With a great team, there is so much freedom ... It kinda of encourages you to do the best you can. We’re having a ball!” Mr. Enninful told The Observer.

Indeed, but is the ball worthwhile, we wanted to know. “Why is fashion week so important for stylists?”

“It’s like the Oscars of fashion. It’s like a get-together on one hand, and you decide how the whole year is going to be, how the whole season is going to be mapped out. September is the January of fashion.”

Well put. We bid adieu to Mr. Enniful, who was off to London in a few hours for more style and mayhem.

There was a sense of powerful austerity and dark romance for spring 2013, and it delivered a bold, physical (read: sexualized) reaction. There is a curiosity to the clothing, one that our fashion eyes could not decipher. Chiaroscuro, cinched waists and overemphasized busts, and innovative fabrics captured the fashion frenzy’s weary attention. The looks featured interesting moiré appearances, glossy leathers layered over tranquil matte crepes and cotton voiles in muted black, reed and cream colors. It highlighted a richness that was not opulently crass.

Looks from the spring 2013 collection.

A novice would have likened the proportions of several dresses to rolls of toilet paper under silk or waxed netting over a cage, but such individuals shouldn’t even be permitted to grace a Calvin Klein Collection boutique.

To end with a bang is no small feat after innumerable ready-to-wear collections of relatively unmoving, routinely practical and safe proportions. American’s sportswear isn’t in a rut; it just is what it is. How lucky we are to have Calvin Klein’s Mr. Costa. We don’t have any callous commentary, just rare bliss, which sadly ended the moment we exited onto ghastly, repulsive 39th Street.

Julie Macklowe. (Patrick McMullan)

“Pretty much every gay man in fashion is here,” a guest remarked at the AIDS Community Research Initiative of America’s “Cocktails at Sunset” benefit on Saturday evening.

And so it seemed. The air was heavily perfumed, and well-fitting white jeans abounded in the backyard of Ross Bleckner’s Sagaponack residence. Despite some wild weather earlier in the week—a smothering heat wave followed by a severe summer storm—the sky had cleared and the beach breeze was cool.

Photographer Stewart Shining expressed his relief at this, telling The Observer that, as the vice president of ACRIA, he’d been running around all day getting things ready and having nightmares about the rain. And with good reason—Kelly Klein told us that she’d attended the annual kickoff at the Bridgehampton Polo Club earlier that day, only for it to be canceled because of Friday’s harsh weather. “But everybody still showed up, so it was a bunch of people with nowhere to go,” she explained, a little exasperated.

But the grass was dry as Jeffrey Bilhuber, Tomas Maier and David Kleinberg milled around the tented lawn, sipping champagne and taking in the silent auction featuring Robert Mapplethorpe’s Fang (1987) and a Robert Longo portrait of Cindy Sherman, which sold for $9,000 and $11,000, respectively.

Mr. Shining assured us he was starting to relax, but his party-organizing duties were not yet over. “People keep texting last-minute, you know, ‘Where’s the party?’” he laughed.

Not long after Mr. Shining’s arrival, Mr. Bleckner strode out his back door and down the lawn, accompanied by his dogs. “My evening’s just beginning,” he told us. “I will say that my dogs seem to be having a good time, though,” he said, gesturing to his three dachshunds.

Stefano Tonchi, the editor of W, was lamenting the summer crowds (“even in my spinning class,” he moaned), when something behind us caught his eye. “Oh my god, you are bright!” he exclaimed. “Wow ... wow!”

A neon-clad Peggy Siegal had just appeared on Mr. Bleckner’s doorstep, where she posed proudly for photographers. “I’m wearing Nanette Lepore,” she informed a throng of admirers, gesturing to her vibrant papaya-colored skirt and revealing a leg through an Angelina Jolie-inspired slit.

“Did you know that neon doesn’t photograph?” Mr. Shining asked his companions. “I keep doing covers for Seventeen magazine—they love neon—and I shoot it, and then it comes up on the monitor and I go, ‘Don’t worry, we’ll make it painted,’” he laughed bemusedly.

Jill Stuart arrived with her daughter, Chloe Curtis. Patrick McMullan rushed up to her. “You’re here with your babies!” he exclaimed. “I’ll make you look beautiful.”

Ms. Stewart told us that her daughter, who recently graduated from Cornell, would be moving to London in a few weeks to study at Sotheby’s in the fall and, in the meantime, catch the Olympics. “Chloe and Sophie,” Ms. Stewart said, referring to the youngest of her three daughters. “They’re going to go to the finals of gymnastics,” she added, which she told us was one of her own favorite sports to watch.

We ran into Julie Macklowe, who eagerly gave us a sample of vbeauté—her recently launched specialty skin care line—anti-wrinkle serum. “It’s the best thing you could ever use,” Ms. Maclowe’s companion, Oliva Oluck, informed us enthusiastically. “You will be impressed.”

Yet Ms. Macklowe revealed that vbeauté might not be the entire secret to her own youthful complexion. “This morning I ran eight miles barefoot!” she reported excitedly, referring to her jogging footwear of choice as “condom shoes.”

“I feel like I have some aches and pains going on,” Ms. Macklowe admitted.

“Last night we went to Papa John’s Café for dinner, and I introduced my daughter, much to the chagrin of my husband, to deep-fried mozzarella sticks!” she elaborated.  “Of course, I proceeded to eat half of them. Needless to say, that’s how the eight miles came about.”

Ms. Macklowe was not the only one taking advantage of the weekend to catch up on exercise. The belle of the evening, the young art director Sofia Sanchez Barrenechea, told us she’d been paddleboarding all morning, demonstrating the required motion with her arms. We asked about her plans for the rest of the weekend. “More paddleboarding,” she told us definitively. “And I’ll probably be doing a lot of eating,” she added, unprompted.

We wandered over to speak with Shelly and Vincent Fremont, who came with their daughter, Casey Fremont Crowe, and spent much of the evening conversing with Bob Colacello. “I have a new grandson who’s five months old, so that’s all I really care about,” Ms. Fremont told us. “We took him to the beach today, which was really fun. He just loved it! It was great.”

Bruce Weber told us he’d been busy working most of the weekend, but he’d be taking time later in the summer to head up to the Adirondacks. “So I’ll be swimming in a lake,” he said, explaining why it was preferable to the beach. “I swim, but I swim now with six dogs,” he explained with a crinkly grin. “They try to keep up and I have to carry them.”

Francisco Costa, the Women’s Creative Director of Calvin Klein, had just returned from a trip to Santa Barbara and was eager to tell us about a new hobby he’d discovered. “For the first time, I did—what do you call it, arch?” He mimed shooting a bow and arrow. “And I hit the bull’s-eye every time!” he exclaimed. “It was so beautiful.”

Mr. Costa told us he’d been spending time barbecuing at his house in Bellport but explained this was his last weekend of the summer. “Summer’s over!” he exclaimed. “This is it for me. I’ll be at home all week and then all the way until the end of August I’ll be in the office, working every single weekend,” he explained, alluding to fall’s looming fashion weeks.

We asked how he’d been dealing with the hot weather. “I love it,” he told us earnestly. “I’m Brazilian, so I keep telling people to just enjoy it.”

eschwiegershausen@observer.com

Michelle Williams is reportedly officially dating her close friend director Spike Jonze, who was previously married to Sofia Coppola. [Daily Mail]  

Vogue intern and New York Ranger Sean Avery, 28, is dating 51-year-old Kelly Klein, ex-wife of Calvin. [P6] 

In the ongoing custody battle between Ron Perelman and Patricia Duff, their 13-year-old daughter Caleigh is refusing to speak to her mother or go on vacation with her, according to the Manhattan judge handling the case. [NY Daily News]  

Not kosher: Former Real World contestant Kevin Powell, who is running for Congress, told an audience of Hasidic Jews Monday night that he would "bring home the bacon." [P6] 

Alex Rodriguez is working things out privately with wife Cynthia regarding visitation rights and alimony payments in order to avoid having to admit to his extramarital affairs in court. [NY Daily News] 

Katie Holmes has arrived in Manhattan to prepare for Arthur Miller's All My Sons, which will premiere on Broadway September 17. [Us Weekly]

NYC Council member Tony Avella is accused of receiving a bouquet of flowers from Pamela Anderson. Quelle scandale! [Politicker] 

“Look, pools are very, very sexy,” continued Mr. Balazs, who said that he plans to spend most of the summer on Shelter Island and in the Hudson Valley. “They’re very sensual—they form, in a weird way, a center. I love water—I’m an Aquarius, but that has nothing to do with it—and I’ve never been away from water in any place.”

Ms. Klein, 50, clad in a simple black dress designed by her ex-husband, Calvin Klein, said that she originally created the book because she was trying to find inspiration for the design of her own pool, and decided to publish it again because “I just thought it wasn’t fair that people couldn’t buy it.” So nice and democratic of her! ((A new first-edition copy fetches about $1,500 on Amazon.)

“I think swimming pools in general are very soothing—the water, the color of the water, the sound of the water, and even just looking at the water,” Ms. Klein continued. “It’s about the architecture: the look of it, the shape of it, the color of it, the reflections of it—that kind of stuff.” She said she no longer has a pool of her own, but does plan to swim in the ocean a lot this summer in East Hampton, where she owns a house.

Mr. Klein, and Vogue editor Anna Wintour, took only brief laps around the room before departing.