Kate Middleton slipped into a silver Jenny Packham dress for her trip to Santa Barbara with Prince William this afternoon. William and Kate arrived at the Polo and Racquet Club by helicopter and were greeted by a handful of famous faces. Rob Lowe, Molly Sims, and Zoe Saldana were among the celebrities on the field as Kate and William walked across the lawn. Prince William will play in a charity polo game today, and Kate will present the winner with their prize. Guests will also enjoy a lunch prepared by chef Giada De Laurentiis. Kate and William arrived in LA yesterday, and they mingled with David Beckham at a reception thrown in their honor last night.

Kate Middleton and Prince William showed up at their second event in California after Kate and Will touched down in LA yesterday. The Duke and Duchess of Cambridge were honored with a reception at the Hancock Park home of the British Consulate after sitting down for the Variety technology conference earlier in the day. Governor Jerry Brown and his wife were on hand for the party as was fellow Brit David Beckham. David looked dapper in a suit, just as he did during the couple's April nuptials that he and Victoria attended. David Beckham said to Prince William that "Victoria really wanted to come but she is just so tired at the moment. She sent you both lots of love." Kate wore color in the form of a green Diane Von Furstenberg dress, which she paired with a leopard clutch by the same American designer. Today Kate and William will continue their West Coast visit at the Santa Barbara Polo and Racquet Club, where William will participate in a polo match and Kate will award the winning team their prize.

It was a busy week for our favorite stars! The fun kicked off over Fourth of July weekend, which brought lots of celebrities to the beach including Reese Witherspoon. Kristen Stewart skipped out on Independence Day festivities to go horseback riding in Palm Springs, and Kate Middleton and Prince William's tour of Canada continued. Jennifer Aniston capped off an exciting few days with her Hollywood Walk of Fame handprint ceremony with her boyfriend Justin Theroux in the front row for support. That's not all that happened though — click through to see this week's best pictures and biggest stories!

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Ben Affleck went shaggy for a Starbucks stop near his Brentwood home on Friday morning. Ben was solo for his coffee run, but spent last July 4 holiday weekend by his girls' side, hanging out with Jennifer Garner and their daughters Seraphina Affleck and Violet Affleck. The Garner-Afflecks attended a Fourth of July parade in their neighborhood, which has become something of a tradition for the family, and also had breakfast by the beach at Shutters in Santa Monica. Ben is enjoying some downtime at home after spending much of the Spring on the road as he scouted locations for his upcoming directorial project. The movie, Argo, will star Ben and Breaking Bad's Bryan Cranston, and is expected to shoot throughout the Middle East.

Jessica Alba had her 3-year-old daughter Honor Warren by her side in LA yesterday afternoon to shop for the family's soon-to-arrive new addition. Jessica and Honor stopped by Bel Bambini boutique to pick up a few things before taking off hand in hand. Jessica, Honor, and Cash Warren celebrated the Fourth of July holiday together on the beach in Malibu as they stick close to home in the final weeks before baby number two. The Alba-Warren trio is looking forward to welcoming a new little one, but yesterday Jessica had another family milestone to mark when Alba's little brother Joshua turned 29. Even with the fourth Alba-Warren on its way, Jessica and Cash make date nights a priority, stepping out for a friend's wedding and going out for dinner together in recent weeks.