Anna Faris shares rare photo of her son as a newborn to promote fundraiser for healthy births worldwide

By George Costantino

Anna Faris shared a previously unseen photo of her son Jack -- whom she shares with ex Chris Pratt -- as a premature baby to help out a good cause.

"Please join me in supporting GAPPS [the Global Alliance to Prevent Prematurity and Stillbirth] on Thursday, May 6th at 6:30pm (PDT)," the 44-year-old actress wrote Wednesday on Instagram, alongside the picture.

"I will be sharing the story of my son's preterm birth 8 years ago as part of @healthybirths 60 minute virtual fundraiser," she added.

Faris welcomed Jack, now 8 years old, in 2012 with her ex-husband, Pratt. He was born nine weeks premature and spent a month in the NICU before Faris and Pratt brought him home.

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A post shared by Anna Faris (@annafaris)

To raise awareness for the upcoming virtual fundraiser, another photo of Faris with baby Jack was posted on GAPPS' Instagram page.

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A post shared by GAPPS (@healthybirths)

Both Faris and Pratt have used their platforms to raise awareness about the health needs of premature babies and other infants requiring specialized care.