Heroes hottie Hayden Panettiere joins cyclist Lance Armstrong, musician Wyclef Jean, actress Rosario Dawson and singer Josh Groban to promote the importance of voting on Monday’s Larry King Live.

“I’m a newbie voter,” the 18-year-old said. “It felt very empowering… very empowering to have a voice and declare yourself.”

Hayden also is the official spokeswoman for voting campaign Declare Yourself.

“Declare Yourself speaks to young people,” she explains. “I’ve said to them, ask your candidates about problems, whether it be environmental or Lance with cancer or war. Ask them what their views are on it.

“Then let that weigh in on their decision.”

When asked by vidoeographers if given the choice between Democrat Barack Obama or Republican John McCain, Hayden said she would definitely choose Obama. However, Hayden still appeared undecided between Obama and rival Hillary Clinton as the Democratic presidential candidate. Momager Lesley (pictured below) was seen standing behind Hayden the whole time she was being asked questions and signing auotgraphs.

Watch Hayden Panettiere on Larry King Live here: Part I, Part II, Part III and Part IV.

10+ pictures inside of Hayden Panettiere @ Larry King Live!… More Here! »

Brad Pitt talks with CNN’s Larry King about helping to rebuild New Orleans, plus his life with Angelina Jolie and their kids.

“[My kids are] as much blood as I am theirs,” Brad says. “And they are brothers and sisters. One was from Ethiopia, one came from Vietnam, one from Cambodia, one was born in Namibia. They have fun, they squabble. It makes me so proud. (pounds chest)”

The father-of-four is among those helping the most vulnerable in the city’s Lower Ninth Ward. He tells Larry about the 150 affordable homes being built post-Hurricane Katrina, and why the “Make it Right” project means so much to him, as well as the people who will live there.

Watch a preview of the interview on CNN. Brad’s actual interview with Larry will air TOMORROW, Dec. 5 @ 9PM ET/PT on CNN.

15+ pictures inside of Brad Pitt @ Larry King Live… More Here! »

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