When she’s not saving the world on her hit show “Heroes,” or being sought out for romance on the set of her new flick “I Love You Beth Cooper,” Hayden Panettiere is all about helping out good causes.

And last night she was spotted hamming it up on the red carpet at Declare Yourself’s Last Call Party, held at Los Angeles’ Green Door.

Miss Panettiere looked sexy and stunning in a sparkly black cleavage-baring top complete with matching black trousers and strappy black platform heels.

Declare Yourself is a nonpartisan, nonprofit organization with the agenda to empower and encourage every eligible American to register and vote.

Gossip Girls

Enjoy the pictures of Hayden Panettiere at the Declare Yourself “Last Call” party (September 24).