Geri Halliwell in Washington D.C.
02/22/2008 at 11:00 AM EST
Geri Halliwell flexed her goodwill muscles in Washington D.C. Thursday, as the Spice Girls reunion tour wound down.
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."