Victoria Beckham has been named a Goodwill Ambassador for UNAIDS, the UN's HIV and AIDS charity, saying she is "honoured" to accept the role.
The fashion designer and former Spice Girl flew to New York yesterday to deliver a speech at the UN Headquarters during a special event during the UN General Assembly that is taking place this week.
She said: "This is the beginning of an important journey for me. As a woman and a mother I have a responsibility to support other women."
"For some reason, people will listen to what I have to say. So I'm going to speak on behalf of the incredible women and the incredible charities that are working so hard in these countries. I'm going to lend my voice."
Victoria visited South Africa in February this year to learn about antiretroviral clinics in Cape Town, which help mothers reduce the risk of passing on HIV to their children as well as suppressing the virus in those already infected.
She commented yesterday that "I've always been involved [in AIDS campaigning] but in the background. And when I was lucky enough to visit South Africa a few months ago, it changed how I feel. I came home thinking 'I have a responsibility.'"
She will work on a campaign which aims to help every child to be born HIV free. In August, Victoria sold 600 items from her own wardrobe on TheOutnet.com to raise money and awareness for mothers living with HIV in sub-Saharan Africa.
"I'm learning. I have people mentoring me. I'm going back to South Africa in a few week and then further afield next year. I'm doing everything I can do. I would do anything for my children and I think every woman has the right to do what she can for her children."
Victoria missed the opening of her first flagship store to speak at the UN event, but her husband David Beckham visited the minimalist-designed store to welcome customers.
Victoria Beckham's flagship store opened yesterday on Dover Street
She kept in touch with the store's opening via Twitter, where she also tweeted her excitement to start working with the UN.
The announcement comes at the end of an exciting week where both Emma Watson and Leonardo diCaprio have spoken to the UN General Assembly to support important causes regarding feminism and environmental issues.
Watch Victoria speaking at the UN below:
Words: Victoria Gray, Images: Rex Features/Twitter