Hayden Panettiere: Legs Out, Buns Out ... for Burgers!!

Hayden Panettiere is rolling up her sleeves, unbuttoning her shirt and slipping into short shorts to become the next burger-munching hottie for Carl's Jr./Hardees.

Hayden showed off some mom-appropriate daisy dukes on the set of the new commercial. The undoubtedly sexy role is awesome for HP ... especially 14 months after giving birth.