Hayden Acts Her Age

4/30/2007 2:43 PM PDT BY TMZ STAFF
Brits who put Hayden Panettiere #6 on their Sexiest Women Alive list might want to think twice.

Hayden, spotted walking her dog yesterday in Los Angeles, was looking more like a Junior High student after gym class than a cheerleader with the power to launch illegal fantasies.

That bitch is really cute.