Sienna Miller Pictures With Jo Miller and Savannah Miller

There was an occasion for Sienna Miller to celebrate her new JewelMint collaboration last night at Ralph Lauren's Wimbledon Party in London. She, along with her mom, Jo, and older sister, Savannah, toasted the annual tennis festivities with legendary player Boris Becker. Sienna, who runs Twenty8Twelve with Savannah, selected a bracelet to be sold on Kate Bosworth's JewelMint. The "Sienna" bracelet is $30, with half the proceeds benefitting the International Medical Corps. The mixture of fashion and philanthropy is Sienna's latest project, though she's been focused recently on wrapping up her run in the West End's Flare Path. Sienna still has time for boyfriend Tom Sturridge, and they showed off a shared affection for action on the court at the French Open earlier this month.