In a widely shared Instagram photo she is seen breastfeeding her baby along with her daughter Lunaâs doll.
The mother-of-two captions the image: âLuna making me feed her babydoll so I guess I have twins now.â
In just one day, the post was liked nearly three million times on Instagram, and 18,000 times on Twitter.
But not all responses have been positive.
Most of those who have criticised the post have been met with a withering comeback from the model.
Replying to a tweet that has since been removed, Chrissy claimed the reason her breastfeeding became a big deal was because of other peopleâs âissuesâ, and that feeding a baby should not be a big deal.
Twitter user Catâo9Tails says she understands that childbirth, menstruating and breastfeeding are natural but she doesnât want to see photos of people doing it.
The model responded: âI donât care to see grainy fireworks, coachella selfies or infinity pool pics but I let people live.â
Some posting on Facebook have called for the model, who is married to singer John Legend, to cover up:
Breastfeeding campaigners say theyâre grateful to Chrissy for sharing her photo and have started using the hashtag #normalizebreastfeeding.
Other followers on Twitter agree it shouldnât be an issue.
Sheâs not the only celebrity who has proudly posted photos of breastfeeding. In 2016, actress Liv Tyler shared âSunday morning snuggles with my baby girlâ.
Line of Duty star, Thandie Newtonâs post of âPerfect happinessâ whilst attending Latitude Festival, also inspired people to leave tips for fellow breastfeeders.
In March, the âIronicâ Canadian singer Alanis Morissette shared a family memory on Instagram using the âThrow back Thursdayâ hashtag, to reminisce.