It's wedding season and that means our favorite celebrities are hitting up the "I do" circuit, too! The chicest of attendees - including Kate Moss, Kate Bosworth, Sienna Miller, Pippa Middleton, Cameron Diaz, and Jennifer Aniston - attain a delicate balance of looking great but not stealing attention away from the bride. We especially loved that Moss ditched her denim for something floral and flirty. Kate Bosworth was ethereal and effortless in a '20s-inspired getup, while Pippa Middleton showed off her famous assets in a black and white Tabitha Webb number. To witness more stars as stylish wedding guests, read on.