Jessica Alba has teamed up with Heroes star Hayden Panettiere for a spoof video urging young people in the U.S. to vote at the upcoming presidential election.

Alba has been a longtime supporter of the "Declare Yourself" campaign, and has made two controversial adverts for the organisation in a bid to encourage Americans to take to the polls in November.

The latest ad featured Alba wearing a Hannibal Lecter-style muzzle.

And now the Hollywood actress has enlisted the help of 19-year-old Panettiere for a satirical clip which has been posted on video sharing website YouTube.

The two stars are seen hosting a mock home-shopping show selling The Muzzler 2008, a similar device to that worn by Alba in the last campaign.

Panettiere is seen modelling a pink version, spelling out to youngsters the need not to let their political voices be silenced.

Marc Morgenstern, executive director of Declare Yourself, tells People.com, "Jessica and Hayden have an amazing ability to connect with young adults. Behind all the humour of the Psa lies a very serious message of what it actually means to sit out the election and effectively silence oneself."