Who wasn't in the Hamptons this weekend? Rag & Bone brought Hilary Rhoda and Cameron Diaz  out for dinner with Baby Buggy, while a dramatic crowd — including Lindsey Wixson, Rick Owens , and Polina Proshkina — gathered at the Watermill Center's annual Summer benefit. Those who weren't beaching on the East Coast went glam with Natalia Vodianova in Monaco. At the annual Love Ball, which was made a royal affair with attendees including Princess Charlene of Monaco and Princess Caroline of Hanover, guests donned fittingly romantic gowns for The Naked Heart Foundation.
Later in the week, activities moved back to New York where screenings of Lovelace and Elysium brought out some of fashion's brightest stars like Olivier Theyskens, Joan Smalls, and Genevieve Jones. A look at all the stylish parties attended, here in the gallery.
Dree Hemingway looked cool and casual in denim and a printed button-down at the New York Vans bash.
Nell  Diamond feted Vans in a pretty cocktail dress at NYC's The Park.
Diane Kruger  was print perfect in her Mary Katrantzou  design, Edie Parker clutch, and Stuart Weitzman  sandals.
Crystal Reed (in Carolina Herrera) and Holland Roden (in Ted Baker) were standouts at the Young Hollywood Awards in florals.
Emma Roberts made her way out of the We're the Millers premiere in her asymmetric black Michael Kors  dress and Casadei  heels.
At the We're the Millers premiere, Jennifer Aniston  worked her curves in a slim Burberry  sheath and Casadei  sandals.
Olivia Wilde  made for a red-hot date in Ozman at the We're the Millers premiere with Jason Sudeikis.
Fabiola Beracasa and Olympia Scarry were chic and covered up at the Art Production Fund's Montauk party.
Eva Chen joined Uri Minkoff at the Lafayette  Lyst launch.
Roopal Patel, Erika Bearman, Nina Garcia, and Sara Beltran were all smiles at the Lyst launch party.
At the Lyst launch, Leandra Medine worked full trousers and a cropped top under her leather moto jacket.
Wes Gordon  and Cannon Hodge made a bright pair at Lafayette  for the Lyst Universal Shopping Cart launch event.
Reece Solomon was sheer perfection in her peekaboo blouse and cutoffs at Lafayette .
Chris Morton and Hannah Bronfman feted Lyst's Universal Shopping Cart launch at New York's Lafayette .
Brittany Adams, Simon Doonan, Kathryn Floyd, Zanna Roberts Rassi squeezed in frame to fete the Barneys bash.
DKNY  Jeans celebrated Chelsea Leyland's birthday where friends including Kilo Kish and Kitty Kash were on hand to celebrate.
At DKNY 's birthday bash for Chelsea Leyland, May Kwok helped get the party going in black and white.
Prabal Gurung  arrived for the New York The Butler screening in white denim that he paired with a blazer.
Tracy Reese  screened The Butler in coordinating yellow designs.
Rachel Roy  accented her pastel pants with a leopard-print topper to screen The Butler.
Rachel Pally  celebrated her Fall collection at Chateau Marmont with Dita Von Teese .
Stacey Bendet took schoolyard inspiration into account when planning her ensemble for the Prince Avalanche screening.
Andie Arthur looked effortlessly cool in her streamlined pairing at the New York Prince Avalanche screening.
At The Cinema Society screening of Prince Avalanche, Barbara Fialho arrived in a minimalist ensemble.
Andrej Pejic brought the edge to The Cinema Society screening of Prince Avalanche.
Cynthia Rowley  hit Paper's annual Super(Duper)Market opening night party in New York.
At the Prince Avalanche screening, Julia Hafstrom went bohemian in a floral maxi dress and boots.
Anouck Lepere walked the black carpet for The Cinema Society screening of Prince Avalanche.
At a panel for The Mortal Instruments, Lily Collins looked lovely in her floral Sachin + Babi design and Casadei  heels.
Kate Hudson  walked the Clear History red carpet in an embroidered Balmain  mini and Casadei  platforms.
Genevieve Jones worked head-to-toe Ferragamo — including a leather-trimmed quilted dress — at The Cinema Society's New York screening of Lovelace.
Joan Smalls showed some skin at the screening of Lovelace in NYC.
At the Lovelace screening, Natalie Joos was seasonal in an LWD.
Amanda Seyfried  hit the afterparty for Lovelace in a sculpted Givenchy  design.
Hannah Bronfman, Leandra Medine, and Harley Viera-Newton kicked off the American Eagle  Rock Your Walk campaign at the label's Times Square store.
At the Times Square American Eagle  bash, Dani Stahl and Johnny Wujek wore their denim with style.
Rachel DiCarlo and Suze Yalof Schwartz stepped out for the American Eagle  Rock Your Walk campaign in New York.
Kyleigh Kuhn dined at Little Owl at the book party for Yearbook Afghanistan.
Caitlin Moe, Chelsea Leyland, and Cleo Wade mixed prints at the Little Owl book launch for Kyleigh Kuhn and Roots of Peace's Yearbook Afghanistan.
Jessica Joffe, Valerie Boster, and Sabine Heller  helped launch Roots of Peace's Yearbook Afghanistan at Little Owl.
Elizabeth Gilpin arrived at New York's Little Owl for the Roots of Peace event.
Jeneil Williams stepped out for Forevermark in a full, bright skirt.
At the The National Arts Club, Olivia Chantecaille  spent the evening with Forevermark in a lacy purple dress.
Erin Heatherton, Karlie Kloss, and Behati Prinsloo were a rainbow of pretty, flirty hues at the New York Body by Victoria Secret celebration.
Michael Kors 's budded designs were standouts on Kilo Kish at the New York Elysium screening.
Pat Cleveland arrived for the Prince Avalanche after-party in a red hot design.
At the New York screening of Elysium, Olivier Theyskens mixed dark, autumnal hues.
Rachel Roy  stepped out in a graphic color combo for Elysium in NYC.
Yigal Azrouël hit the black carpet for Elysium in dark denim.
Byrdie Bell topped her summery dress with an oversize hat while screening Elysium in New York.
Jess Weixler was sheer perfection in her mixed-medium design while attending the New York screening of Elysium.
Kate Upton unveiled her David Yurman  campaign at the label's annual rooftop soiree.
Atop a Tribeca rooftop, Alexis Bryan Morgan stood out in a bright dress for the annual David Yurman  Summer party.
Selby Drummond and Rickie De Sole feted the latest David Yurman  designs at the label's annual rooftop soiree.
Rose Byrne was a floral delight in Erdem 's vibrant designs at the New York I Give It a Year screening.
Hilary Rhoda accessorized her crisp separates for maximum impact at the I Give It a Year screening.
Danielle Snyder screened I Give It a Year in a colorful print.
Jennifer Missoni  looked stylish and laid-back in printed shorts at the I Give It a Year screening.
Shailene Woodley made black look not so basic in two piece Proenza Schouler  for the New York screening of The Spectacular Now.
Looking sweet and chic in her colorblock pastels, Laura Bailey helped reveal BMW's electric car, the i3.
Poppy Delevingne looked cool and casual at the reveal for the BMW i3 in a slim black ensemble that she topped with a denim button-down.
Amber Le Bon sparkled in a glittering sheath and embellished platforms at the BMW unveiling of the i3.
Sienna Miller  helped unveil BMW's first electric car in a playful floral Dolce & Gabbana  dress.
Tilda Swinton hit the Seoul red carpet for the Snowpiercer premiere in an asymmetric Valentino Haute Couture design.
Solange Knowles took the stage in a printed Clover Canyon set and Aldo Rise shoes for Vitaminwater in Brooklyn.
Wearing coordinating cat-eye shades, Kelly Wearstler  joined Natasha Esch in Sag Harbor  for her book signing.
Mark Wahlberg  kept Rhea Durham on his arm for the New York premiere of 2 Guns.
Tilda Swinton greeted fans at a Snowpiercer press conference in a lacy coat from the Valentino Haute Couture collection.
Staying on theme, Lindsey Wixson looked sinister in Gabriela Cadena at the Devil's Heaven bash to benefit the Watermill Center.
Lisa Perry  and Samantha Perry made a colorful combo at Devil's Heaven for the Watermill Center.
At the Devil's Heaven benefit for the Watermill Center, Jill Stuart  was lovely in a pastel gown.
Stefano Tonchi and Cindy Sherman made a dynamic duo at the Watermill Center's Devil's Heaven bash.
Nanette Lepore  dared to pair bright colors at the Watermill Center's Summer party.
Lisa Marie Fernandez  joined Doug Lloyd in the grassy setting for the Watermill Center's Devil's Heaven annual Summer benefit.
At the Devil's Heaven Watermill Center benefit, Alexander Gilkes and Misha Nonoo made an attractive duo in classic blue and white.
Polina Proshkina was not to be missed in her graphic Marc Jacobs  gown while attending the annual Watermill Center benefit.
Wearing coordinated dark hues, Genevieve Jones (in Gabriela Cadena) and Harry Brant feted the Watermill Center at the annual Summer benefit.
Rick Owens  balanced the bright colors of Stacy Engman and Annelise Peterson's bright designs at the annual Watermill Center Summer benefit.
Natalia Vodianova hosted the Love Ball in red and joined guests including Karl Lagerfeld in benefiting The Naked Heart Foundation.
At the Love Ball in Monaco, royalty turned out to support The Naked Heart Foundation, including Prince Albert II of Monaco, an Atelier Versace-clad Princess Charlene of Monaco, and Princess Caroline of Hanover.
In Montauk, Chelsea Leyland kept the crowd on their feet at Samsung's Summer DJ series.
Hilary Rhoda stepped out in a wild jumpsuit for the East Hampton Baby Buggy dinner.
A white-clad Cameron Diaz  joined Rag & Bone at the Baby Buggy Summer dinner in East Hampton.
Naomie Harris was print perfect in Mary Katrantzou  for the Audi International Polo match.
Zoe Saldana  defined "red hot" at the Audi International Polo match.
Zosia Mamet joined The Hollywood Reporter and Samsung in a bright print at the screening of The Spectacular Now.
Shailene Woodley bared her midriff in crisp white separates at The Hollywood Reporter's Montauk event.
Lauren Bush Lauren and Dylan Lauren looked cool and casual while attending The Hollywood Reporter and Samsung's The Spectacular Now screening.
At the Montauk The Hollywood Reporter screening of The Spectacular Now, Lisa Perry  brightened things up in an aqua shift.