Pretty pissed off, Lili took to her Instagram story to address the rumours.
"It's unfortunate that one unflattering photo of my stomach circulating the internet causes hundreds of people to think that I'm pregnant," she began.
"Nope. Not pregnant. This is just my body. And sometimes I'm bloated. Sometimes an unflattering photo is taken of me. Sometimes I go through periods of time where I gain weight."
Now, her best friend and Riverdale co-star Camila Mendes has come to her defence.
"Inspired by you @lilireinhart," she wrote on her Instagram stories. "I feel bloated 24/7, my weight fluctuates constantly — it comes with being a woman and should be celebrated, not criticized.
"I used to fear that day that people start publicly criticizing my body and commenting on my weight,” Camila added. “I’ve suffered too much from my own self criticism and wasn’t sure that I could handle it from others. But seeing somebody as beautiful as Lili respond to public scrutiny by preaching and practicing self love is all it takes for me to overcome that fear. Proud to call her my friend. Let’s continue inspiring women to love their bodies."