Mother's Day 2013

Moms-to-Be Who've Dared to Bare!

From Kelly Rowland and Christina Aguilera to Shakira and Jessica Simpson, see which stars have stripped down to belly basics

SHAKIRA

"The countdown begins!" wrote the singer after sharing a sexy black-and-white photo of herself and shirtless boyfriend Gerard Piqué. Besides showing off her beautiful bump, The Voice's judge also posted the revealing portrait to help raise awareness for her work as a UNICEF global ambassador. "To celebrate the arrival of our first child, we hope that, in his name, other less privileged children in the world can have their basic needs covered through gifts and donations."