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After the House of Representatives passed a bill to cut millions in federal funding for women's health care centers, a slew of Hollywood stars have aligned with Planned Parenthood and are speaking out in a bid to encourage Americans to sign a petition opposing the proposed cuts.

"The House passed a bill to eliminate our country's family planning program and to stop Planned Parenthood health centers from receiving any federal money to provide life-saving preventative care," 26-year-old actress Scarlett Johansson said in a new PSA released this week. “That means no money for cervical cancer screenings and breast exams. No money for testing and treatment of STDs, not even testing for HIV. No money for birth control… For many people, especially those with low incomes, Planned Parenthood is their only source of health care."

Oscar-winner Gwyneth Paltrow is doing more than just complaining about the hot-button issue to her personal circle of friends.

“I stand behind planned parenthood because of the access they give to preventative healthcare including screening for cancer and STDs,” she said in her own national PSA video this week.

Rachel Bilson, Gabrielle Union, Julianne Moore, Dana Delany, Amber Tamblyn, David Eigenberg, Alan Cummings, and Jason Alexander have lent their support to Planned Parenthood, which operates over 800 centers across the country.

Even 17-year-old tween sensation and “iCarly” starlet Miranda Cosgrove is not happy with the situation.

“It is definitely upsetting,” she told FOX411’s Pop Tarts column at the ELLE Women in Music event in Hollywood this week. “People really need as much help as they can.”

Former “American Idol” judge Kara DioGuardi concurred.

“I don’t think it’s a good thing to cut those budgets. It’s hard because we are going through a tough time economically, and sometimes they cut money from things that we really need to keep,” she said, while “Paramore” lead singer Hayley Williams added that it “is good that everyone, including young girls, can have a place to go and take care of themselves.”

New York-based media strategist Adam Weiss said Hollywood stars have little pull in influencing America’s political policies, however.

“The constant drumbeat that comes out of Hollywood backfires,” he said. “The more they speak out on social and political issues the more the rest of America turns the cheek and looks the other way.”