Panettiere checks out the newly blonde Rumer Willis's 'do. Plus: Justin Timberlake, Hilary Duff and more

DECLARATION OF HOTNESS

A leather-clad Justin Timberlake causes a flashbulb frenzy on the blue carpet at the Declare Yourself party. Inside, the singer got not one, but two hugs from Heroes star – and 18-year-old spokesperson – Hayden Panettiere.