Why should I watch my weight when I'm pregnant, asks Chyna

Model Blac Chyna is not afraid to pack on the pregnancy pounds.

After previously declaring her goal was to gain 100 lbs. during her pregnancy, the 28-year-old fiancee of Rob Kardashian showed off a photo of her growing baby bump on Instagram.

She poses in a pink dress featuring cut-outs around the torso on the back of a couch.

"Why should I watch my weight when I'm pregnant," she captioned the photo.

She has been documenting her baby weight on social media. In June, Chyna, who is already mother to three-year-old son King Cairo, stepped on a scale and revealed she weighed 165.6 lbs.