The muzzling continues!

Jessica Alba – who has already been "silenced" in two shocking ads for Declare Yourself – is back, starring in a new video that encourages young people to vote. And this time she's joined by Hayden Panettiere.

In the satirical video clip, Alba hosts a mock home-shopping show selling "The Muzzler 2008." (It's the same Hannibal Lecter-type mask the actress modeled in her most recent ad.)

The Heroes star comedically chimes in, praising the device's ability to mute voters' voices. (The clip also features Tristan Wilds from 90210.)

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

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