The 35-year-old wife of John Legend made a guess that she was reacting to an orange she had bitten into.
"I bit an orange to try to open it and I think there must have been like a pesticide or something on it," she said.
"Oh, it's like hard," she said.
"Look how bouncy it is!" she giggled while flicking her bottom lip.
In a later post, she said, "I feel like it's getting bigger."
Chrissy married her Grammy-award winning musician husband in 2013 and they have two children, Luna, 4, and Miles, 2.
The model's had a devastating miscarriage in September 2020, losing her third child at around 20 weeks into her pregnancy.
The star had told fans that she would never be pregnant again after experiencing the tragic loss.
