Christina Aguilera undertakes charity work as she prepares to give birth

Pregnant singer Christina Aguilera has dedicated her final few days before giving birth to helping other mothers around the world.

The Fighter hitmaker is preparing to welcome a baby girl with her fiance Matt Rutler, and she has been spending the last days of pregnancy undertaking charity work.

Aguilera is a long-time supporter of the United Nations World Food Programme (WFP) and Yum! Brands' World Hunger Relief effort, and she is spearheading a new drive called #PasstheRedCup to help mothers around the world who are struggling to feed their children.

She has posed for pictures holding a red cup on her pregnant belly and penned a blog about her experiences in Rwanda last year (13) for Huffingtonpost.com.

Aguilera writes, "So much can change in life in just one year. This summer, I've been preparing for the arrival of my new baby girl and working on recording new music for my next album. It's hard to believe that about the same time last year I was in the fields of Rwanda with the United Nations World Food Programme (WFP) and Yum! Brands' World Hunger Relief effort. The beautiful faces of the young mothers and children I met in Rwanda are with me every day and fuel my passion to raise awareness about the critical global hunger issue.

"It's heartbreaking to me that in our social media driven, increasingly-connected world, nearly 850 million people go to bed hungry each night. And this includes far too many children. It's a subject so close to my heart and has been for a long time, being a mom."

Aguilera is also mother to a six-year-old son named Max, from her first marriage to Jordan Bratman.