Pink 'Proudly' Shares Throwback Pic of Daughter Willow in Honor of National Breastfeeding Week

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Pink celebrated National Breastfeeding Week with a heartwarming throwback photo.

The "Just Like Fire" singer took to Instagram on Wednesday to commemorate the occasion, sharing a flashback snapshot of her now-5-year-old daughter, Willow, nursing from her mom when she was a baby.

WATCH: Pink Talks Baby Willow and Breast-Feeding

"In honor of #nationalbreastfeedingweek2016 I proudly post this photo of a very HEALTHY, NATURAL act between mother and child," the 36-year-old pop star captioned the pic. "Taken in Helsinki by a very supportive and proud Papa."

PHOTOS: Celebrity Moms Share Breastfeeding Pics

Pink and her husband, former motocross star and off-road racer Carey Hart, welcomed their daughter in June 2011.

A number of celebrity moms have been vocal and active recently about the importance of normalizing breastfeeding. Many have taken to social media to share their own nursing photos, including Liv Tyler, who shared this sweet snapshot last month.

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