1. Kristen Stewart and Taylor Lautner

Kristen Stewart and Taylor Lautner stirred up some New Moon buzz south of the border when they posed at a photo call at the Four Seasons Hotel in Mexico City.

2. Marc Jacobs and Lady Gaga

Lady Gaga teamed up with Marc Jacobs—who dressed her in an ensemble from his latest collection—to make sure she made a memorable appearance at the 13th annual Ace Awards, held at New York City’s Cipriani restaurant. Gaga picked up the Stylemaker Award at the fashion fete, hosted by the Accessories Council.

3. Molly Sims and Diane Von Furstenberg

Also at the ACE Awards, Molly Sims had the honor of presenting Diane Von Furstenberg with the Accessory Visionary Award. Other winners included Tom’s Shoes founder Blake Mycoskie, Bottega Veneta’s Tomas Maier and InStyle’s own Hal Rubenstein, who was presented with the Marylou Luther Award for Fashion Journalism.

4. Rashida Jones and Olivia Wilde

Rashida Jones and Olivia Wilde kicked their heels up in celebration of the Jimmy Choo for H&M collection during a party at a private residence in Los Angeles. The buzzed-about line hits stores November 14th.

5. Kate Bosworth and Diane von Furstenberg

Kate Bosworth showed her appreciation for Diane von Furstenberg at the opening of the designer’s “Journey of a Dress” exhibition at Moscow’s Manezh Exhibition Hall. The revelers in Russia for the event later moved to the We Are Family nightclub for an after-party.

6. Ashton Kutcher and Demi Moore

The day after hanging with the boys at the GQ Gentlemen’s Ball, Demi Moore and Ashton Kutcher enjoyed a more low-key evening during a party for the new beauty book, All You’ve Ever Wanted, hosted by Vanity Fair and L’Oreal at New York City’s Monkey Bar.

7. Kerry Washington and Georgina Chapman

Kerry Washington helped honor Marchesa’s Georgina Chapman for her creative contributions to the fashion industry at the Young Patrons of Lincoln Center’s fall masquerade gala, held at Alice Tulley Hall in New York City. Despite the chill in the air, both ladies wore mini Marchesa party dresses and Georgina Chapman for Garrard and Marchesa clutches. After the ceremony, Chapman continued the celebration at the Interview magazine after-party, held at the Library on Hudson.

8. Julianne Moore, Francisco Costa, Kylie Minogue

Calvin Klein creative director Francisco Costa enjoyed the company of tablemates Julianne Moore and Kylie Minogue at the Rob Pruitt Presents: The First Annual Art Awards, held at the Solomon R. Guggenheim Museum in New York Cty.

9. Marc Forster and Zoe Saldana

Film director Marc Forster and Zoe Saldana were thinking green during a dinner hosted by Audi Diesel. Jaime Pressly, Radha Mitchell and New Moon star Elizabeth Reaser were also among the crowd at the car maker’s celebration, held at the Sunset Tower Hotel in West Hollywood.

10. Patrick Robinson and Stella McCartney

Stella McCartney met up with Gap Creative Director Patrick Robinson and his son Wyeth in N.Y.C. to celebrate the launch of her new kids collection for the brand. “It has a mix of the playful and practical,” McCartney said of the eclectic lineup. “There are pieces that are classic and sort of timeless, mixed with more playful and a little bit cooler pieces.” Stella McCartney for GapKids and babyGap will be available in stores starting November 2nd.

11. Demi Moore and Ashton Kutcher

Demi Moore (in Prabal Gurung and Cartier diamonds) and Ashton Kutcher (in Calvin Klein) were color coordinated when they attended GQ magazine’s Gentlemen’s Ball at New York City’s Edison Ballroom.

12. Adrian Grenier and Mark Wahlberg

Also at the Gentlemen’s Ball, Adrian Grenier and Mark Wahlberg—who just announced that he and wife Rhea Durham are expecting their fourth child—celebrated their participation in this year’s GQ Gentlemen’s Fund. While Grenier will raise funds for Oceana, Wahlberg will drum up support for his own Mark Wahlberg Youth Foundation.

13. Sheryl Crow, Jessica Capshaw and Amy Smart

Sheryl Crow and Jessica Capshaw (in Diane von Furstenberg) showed their motherly love for a greener, cleaner, safer home at the Healthy Child Healthy World gala in Beverly Hills. The duo helped honor this year’s “Champions of Children’s Health,” which includes InStyle’s own Cyd Wilson, who is the founding Director of Development of the Elizabeth Glaser Pediatric AIDS Foundation.

Aki Quang (from IS)