Kate Bosworths' smile couldn't have been any bigger as she arrived and left The XChange for the Vacheron Constantin Platinum Excellence event honoring Clive Davis (the platinum selling record producer and executive of BMG). In a pretty frock and black boots, Kate looked very well as she attended the event with her (annoyingly fit) boyfriend James Rousseau. The pair couldn't stop giggling as they left in their cars. Pictures: Edward Opinaldo / Jennifer Mitchell