The cast of Horrible Bosses gathered in London this evening for their UK premiere. Jennifer Aniston was in a white Valentino couture dress and Tom Ford shoes for the occasion, after steaming up a morning photocall in a hot black leather mini. She joked around with costar Jason Sudeikis once inside the city's BFI Southbank theater, while the other leading men hit the blue carpet with their significant others. Jason Bateman stuck close to his LBD-wearing wife, Amanda Anka, while Charlie Day proudly stood next to his pregnant spouse, Mary Elizabeth Ellis, who also happens to be his It's Always Sunny in Philadelphia costar. Charlie and Mary Elizabeth, who married in 2006, will welcome their first child together in December. The dark comedy is out in England this Friday and opens in other countries across Europe throughout August.

Reese Witherspoon ran errands in Studio City yesterday in a summery dress and platform sandals. Reese has been hanging out close to home lately and enjoying family time with her new husband, Jim Toth, and kids Ava Phillippe and Deacon Phillippe. She paid Jim a visit at CAA, where she is also a client, last week and has also been fitting in retail therapy when she's not hanging out with her son and daughter. Reese picked up a few new items at Vanessa Bruno and also stopped by Neiman Marcus to shop earlier this month. The actress won't have a new film to promote until This Means War premieres next year, but she attended a different kind of special event recently when she was invited to a charity reception with Prince William and Kate Middleton.

Matt Damon spent yesterday afternoon riding around Vancouver with his favorite ladies, wife Luciana, daughters Isabella and Gia, and his mom, Nancy. The Damon family has relocated to Canada for the time being while Matt preps for his upcoming role in Elysium. From the muscles bulging under his tight t-shirt, it looks like Matt's been bulking up in addition — he also shaved his head! Matt costars in the futuristic alien movie alongside Jodie Foster and Sharlto Copley under the direction of District 9's Neill Blomkamp. There's also a new Contagion trailer that showcases Matt's other upcoming thriller.

Chris Evans teamed up with his Captain America castmates last night for their premiere at LA's El Capitan theater. The superhero movie also features Sebastian Stan, Hayley Atwell, and Dominic Cooper. Some of Chris's high-wattage costars from his next project The Avengers also walked the red, white, and blue carpet to drum up buzz for their film. Robert Downey Jr. and Samuel L. Jackson attended the debut, as did Chris Hemsworth, with wife Elsa Pataky by his side. We spoke with Chris Evans, who looked dapper in a suit and tie, as he made his way into the movie. He told us he was most intimidated to meet and work with Robert on The Avengers, which brings together many of Marvel's most beloved comic book characters, including Captain America, Iron Man, and Thor. Chris also admitted he hated training for Captain America when we caught up with him last weekend, because he had to eat constantly to bulk up and work out with a "relentless" trainer, but clearly the effort paid off!