Fashion photographer Steven Klein opened up his Bridgehampton estate on Saturday evening to host the summer benefit for the AIDS Community Research Initiative of America (Acria), which funds HIV and AIDS-related research, treatment, and education. Sponsored by Calvin Klein Collection and Vanity Fair, the benefit attracted Sarah Jessica Parker and Matthew Broderick, Francisco Costa, Italo Zucchelli, Rachel Zoe, Daphne Guinness, Lauren Santo Domingo, Euan Rellie and Lucy Sykes Rellie, Nacho Figueras, Olivia Chantecaille, Stefano Tonchi, Jane Holzer, and Royal Pains cast members Mark Feuerstein, Jill Flint, Paulo Costanzo and Reshma Shetty, among others. Cityfile correspondent Douglas Marshall took a few mintues to chat with famed artist—and longtime Acria supporter—Ross Bleckner about art, life, and Dash Snow.

The Cinema Society and Details magazine hosted a screening of The Hangover last night at the Tribeca Grand, which was followed by an afterparty at the Soho Grand. Details editor Dan Peres, Cinema Society's Andrew Saffir, and Bradley Cooper and Justin Bartha, who both appear in the film, welcomed Rachel Roy, Amy Sacco (left), Nicole Miller, Will Arnett, Zach Braff, Gerard Butler, Molly Sims, Chris Meloni, Caroline Rhea, Alan Cumming, Shoshanna Lonstein Gruss, Albert Hammond Jr., Jill Hennessy, Jesse Eisenberg, Hilary Rhoda, Dan Abrams, Danny Masterson, Byrdie Bell, Kelly Bensimon, Rob and Marisol Thomas, Caroline Winberg, and Doutzen Kroes, Alexandra Richards, and Paula Abdul. [PMC, WWD, Wireimage, VF]

Is the banker suit dead? Yes, according to the same guy that NYT fashion trend story reporter David Colman has quoted four times:

The New Yorkers for Children benefit attracted a predictably star-studded crowd to the Mandarin Oriental on Wednesday night. In addition to Zac Posen and Coco Rocha in matching ensembles, guests included Josh Hartnett, Emmy Rossum, Andre Balazs, Christine and Steve Schwarzman, Rachel Roy, Rachel Zoe, Topper and Tinsley Mortimer, Lucy Sykes Rellie and husband Euan Rellie, Andres and Lauren Santo Domingo, Alexis Bryan, Fabiola Beracasa, Gillian Hearst Simonds, Diane Kruger and Joshua Jackson, Gillian and Sylvester Miniter, Olivia Palermo ...

Jamie Dimon (left) is the CEO of JPMorgan. Byrdie Bell (right) goes to a lot of parties. What do the two have in common? Absolutely nothing, except they're both celebrating birthdays today: Dimon is 53; Bell is turning 24. William H. Macy turns 59 today. Kathy Hilton, the woman who brought Paris Hilton into this world, is 50. Emile Hirsch is 24. Mets pitcher Johan Santana is turning 30. Political commentator Charles Krauthammer is 59. Mediabistro founder Laurel Touby is turning 46. Common is 37. Danny Masterson is 33. Dana Delany is 53. And Neil Sedaka is turning 70. Weekend birthdays after the jump!

The Villency Emerging Fashion Program hosted a dinner at Bobo on Wednesday night to honor Elise Overland and threeASFOUR designers Adi, Ange and Gabi. Eric Villency and wife Kimberly Guilfoyle welcomed a collection of fashion and social fixtures, including Zani Gugelmann (left), Byrdie Bell, Daniel Benedict and Andrew Saffir, Ann Dexter-Jones, Richard Johnson, Hope Atherton, Kate Schelter, Maggie Betts, Horacio Silva, Jessica Joffe, Glenn O'Brien, Ferebee Bishop, Gigi Stone, Tom Sachs, Serena Merriman, Poppy de Villeneuve, and Stephanie LaCava. [PMc, FWD, VF, GoaG]

The voicemail message at Lucy Sykes and Euan Rellie's apartment.

Few figures on the New York social scene are as ubiquitous (or charming) as Euan Rellie, the Brit-born banker, husband of Lucy Sykes, and veteran man-about-town. So when he sits down with Men.Style.com and shares his list of holiday party tips, you'd be well advised to pay close attention. (After all, he'd better have something to show for his 665 pictures on Patrick McMullan.) After the jump, Rellie's tips on playing the perfect guest and hosting the perfect soirée, including what you should and shouldn't talk about (talking about kindergarten admissions is boring; discussing racism with Spike Lee is dangerous); why people will have more faith in you if you pretend you're British ("there's a spurious credibility that comes from speaking in an accent"); why decor doesn't matter (it's the guest list that counts); and why it's important to make sure lots of pretty girls are there: "Everybody likes pretty girls, from octogenarian aunts to your kids to gay guys to boring married guys." And don't let the grim talk of a recession (including our own) deter you: "When the economy gives you lemons, you'd better be able to twist them into some festive cocktails."

Vito Schnabel (son of Julian) and Olivier Sarkozy (half-brother of Nicolas) hosted Terence Koh's "Flowers for Baudelaire" exhibition on Wednesday night at Richard Avedon's former studio, where the unusual art was admired by the likes of Anna Wintour, Simon de Pury, Jeffrey Deitch, Allison Sarofim, Stella Schnabel, Olmo Schnabel, Lola Schnabel, Jacqueline Schnabel, Zac Posen, Ann Dexter-Jones, Nadine Johnson, Theodora Richards, Alexandra Richards, Byrdie Bell, Benjamin Cho, Cynthia Rowley, Salman Rushie, Lyor Cohen, Todd Eberle, Derek Blasberg, Genevieve Jones, Yvonne Force Villareal, Drena De Niro, Lisa Anastos, and Gilles Bensimon. [PMc, NYM, GoaG]

♦ Narciso Rodriguez was the man of the hour at Bergdorf Goodman last night, where he celebrated the launch of his new coffee table book with guests like Julianna Margulies (left), Jessica Alba, Linda Fargo, Reed Krakoff, Virginia Smith, Roopal Patel, Jim Gold, Isabel and Ruben Toledo, Simon Doonan, Hal Rubenstein, Jaime King, Christopher Wheeldon, Dani Stahl, Linda Wells, Mickey Boardman, Patti Scialfa, and, his dad, Narciso Rodriguez Sr. [Paper, PMc, The Daily]

1) The 303's new gallery in Chelsea was christened last night with a performance by The Virgins and partiers Lisa Spellman, Kirsten Dunst, Matt Creed, Thurston Moore, Serge Becker, Anna Sui, Byrdie Bell, Cynthia Rowley, Poppy de Villeneuve, Genevieve Jones, Julia Restoin-Roitfeld and Magnus Berger (left), Jessica Stam, Marilyn Minter, Sean MacPherson, and Rogan Gregory. [PMc/FWD]

1) The ACRIA benefit at photographer Steven Klein's Bridgehampton farm, sponsored by Calvin Klein Collection and Vanity Fair, invited guests for "Cocktails at Sunset." A boldface-heavy crowd including Bruce Weber, Jessica Stam, Donna Karan, Daphne Guinness, Rachel Zoe, Elizabeth Saltzman, Francisco Costa, Kelly Bensimon, Padma Lakshmi (above right), Carol Alt, Calvin Klein, Joy Bryant, Karolina Kurkova, Olivia Chantecaille, Mary Alice Stephenson, Anh Duong, Sessa von Richthofen, Zani Gugelmann, Jackie Astier, Lucy Sykes and Euan Rellie, and committee member/host Andrew Saffir (above left) ate mini-burgers and tater tots, and bid on a Steven Klein print of Madonna from W magazine. [FWD/Style.com]

The dapper, well-groomed Rellie works in finance, but he's better known for his social presence and for his Brit designer wife, Lucy Sykes.