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Halliwell (a.k.a. Ginger Spice) stopped by the nation's Capitol to lobby Congress for maternal health care and AIDS relief as part of her work as a goodwill ambassador for the U.N. Population Fund (UNFPA) – something she's been a part of for the past 10 years.
"We all are mothers or have a mother, so we need to support the mothers of the world," Halliwell, 35, told PEOPLE of her visit to Congress to "speak for people who don't have a voice."
As a mother herself (daughter Bluebell turns 2 in May), her work with the U.N. hits even closer to home. "I think it resonates and authenticates it for me," she told PEOPLE, "Especially having a baby myself."
When asked about the most memorable experience she's had as a U.N. ambassador, Halliwell said, of a recent trip to Zambia, "Going to the villages and seeing light in the children's eyes when they see that they are not forgotten and that people care."
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