Matt Damon arrived hand in hand with his lovely wife, Luciana, at tonight's NYC premiere of Contagion. The couple posed for photos before Matt went on to meet up with Marion Cotillard and director Steven Soderbergh on the red carpet. It was a wild day for Matt, who kicked things off before dawn with appearances on The Today Show and Live With Regis and Kelly. Matt touched on the seriousness of infectious disease, the focus of the film, and then switched gears to a lighter subject when he revealed he'll be dropping three of his daughters off for the first day of school this week. Marion arrived on the East Coast with her son, Marcel, recently and was also busy hitting the talk show circuit. She dropped by Late Night With Jimmy Fallon this afternoon and is scheduled to visit The Daily Show With Jon Stewart tomorrow. Matt and Marion's costar Gwyneth Paltrow stepped out to promote the film in Venice over the weekend, but tonight she missed out on the Big Apple screening. Instead, Gwyneth partied with friends in London.

Gwyneth Paltrow was radiant in an orange Lanvin dress at a dinner for Coach in London tonight. She covered up the bright ensemble with a black and white jacket on her way into the event, but the tan she recently picked up in Italy was still on display. Gwyneth traveled to Venice to attend the Contagion premiere at the city's film festival and capped off her trip with a visit to Beyoncé Knowles and Jay-Z on a nearby yacht. It was back to work for Gwyneth today though, and she mingled with guests, including Thandie Newton, at the Coach soiree. Her ads for the brand were released in July, and the event marked the opening of the company's first European flagship store. Gwyneth's spokesmodel duties kept her away from this evening's Contagion screening in NYC; though, costars Matt Damon and Marion Cotillard are on hand to represent the project.

Reese Witherspoon was joined by her husband, Jim Toth, and kids, Ava and Deacon Phillippe, in LA today for a family trip to an afternoon treat. The foursome made an after-school pit stop at Pinkberry and then continued on their way. Looking quite dapper, Deacon stepped out in a fedora, vest, and tie, while Ava wore pearls and Reese carried her trusty Chloé bag. Reese, Jim, and the kids had an exciting Summer filled with beach vacations and shopping trips, and now with school back in session, it's back to hitting the books and hanging with loved ones close to home. Family is important to the actress, and in a recent interview with Marie Claire, Reese talked about Jim and the kids, saying, "I got lucky. I did. I got very lucky, and he's so wonderful with the children. I'm very blessed."

Sarah Jessica Parker stopped for pictures when she arrived at the Ed Sullivan Theater in NYC today. She chose a bright red and pink Prabal Gurung ensemble for the appearance, which is just the latest stop on her press tour for I Don't Know How She Does It. SJP kicked off promotions in Russia last month and later popped up in London for a photo call. The actress brought her many fashionable looks overseas, donning a red Giambattista Valli gown and cape in Moscow and a floral Prabal Gurung dress during her time in the UK. There will be plenty of opportunities for SJP to show off her style since all the NY Fashion Week fun gets started tomorrow with Fashion's Night Out. Sarah Jessica will join the festivities with an appearance at Manolo Blahnik's Manhattan boutique, where they'll be serving the designer's favorite treat, milk shakes.

Beyoncé Knowles was in a bikini yesterday while checking out the views of the water in Hvar, Croatia with her husband Jay-Z! It's their latest stop on a yachting vacation that saw them first visiting Venice, where Beyoncé and Jay-Z welcomed pal Gwyneth Paltrow aboard to celebrate B's 30th birthday. Now Jay and Beyoncé are on the island where Prince Harry let loose – and got wet — with friends two weekends ago. Jay-Z and Beyoncé manage to find the chicest spots for their annual European vacations, and their impending delivery hasn't changed that. They're clearly having fun between milestone and baby parties, and we celebrated their status as parent-to-be with a look back at Jay-Z and Beyoncé's cutest moments over the course of their 10-year romance.

Jessica Alba and Honor walked around a mall in LA this afternoon. The new big sister wore a striped romper, while Jessica was decked out in a floral maxi dress. Jessica and Honor have been out and about since welcoming the newest addition to their family, Haven, in August, though we haven't gotten a glimpse of the almost 1-month-old yet. Since giving birth, the mom of two has been spending quality time with Honor and also getting back into her fitness routine. She started working out just two weeks after her second daughter arrived, and she's been keeping it up with frequent gym visits and hikes with friends.

Gossip Girl was back filming on location in NYC today, and Blake Lively didn't let the rain dampen her mood. Blake kept warm in a pair of sweat pants and rain boots; however, when the cameras started rolling she slipped into a pair of lime green stilettos and ditched her baggy pants in order to show off her famously long legs. The new season kicks off Sept. 26, and Buzz has a first look at Gossip Girl's season five promo. The cast heads to the West Coast for the opening episode full of sexy hookups, lies, and, of course, fantastic fashion. Blake spent a few weeks in LA filming for that episode, which gave her additional time to hang with boyfriend Leonardo Dicaprio. He's currently on location in Australia filming The Great Gatsby but that hasn't stopped the couple from seeing each other since Blake's reportedly already visited Leonardo in Sydney.

Brad Pitt touched down in London by helicopter this afternoon after traveling back from the set of World War Z in Glasgow. The flight has become part of Brad's routine commute since moving his family to the UK for production last month. His time overseas hasn't been all about work, though, since Brad and Angelina Jolie have taken advantage of their location with fun outings. The Jolie-Pitts saw The Smurfs over the weekend, but Brad took a few of the children to a movie on his own during the week. Angelina has also been out with the kids solo, recently taking Zahara and Shiloh on a girls' only shopping trip.