"I have to make an apology to everyone — I was sent a picture to share on social for Fallon that was altered without me knowing to make my arms look smaller," Rousey wrote on Instagram. "I won’t say by who — I know it was done with severely misplaced positive intentions — but this goes against everything I believe and I am extremely proud of every inch of my body.
"And I can assure you all it will never happen again. I could not be more appalled and hope you all forgive me."
Rousey has long opposed body shaming after dealing with bullying and self-image issues as a teenager while rising up the ranks in judo.
She eventually came to love her body and when she became famous she spoke out against the idea that a beautiful woman is shaped only one particular way. Ahead of her fight against Bethe Correia last August, Rousey dropped one of her most famous speeches while talking about her body and how proud she was of every muscle and curve she worked to attain.
"That’s why I think it’s hilarious if people say that my body looks masculine, or something like that. I’m just like, ‘Listen, just because my body was developed for a purpose other than f–king millionaires doesn’t mean it’s masculine," Rousey said.
"I think it’s femininely bad-ass as f–k because there’s not a single muscle on my body that isn’t for a purpose. Because, I’m not a do-nothing b–ch. It’s not very eloquently said, but it’s to the point. And, maybe that’s just what I am. I’m not that eloquent, but I’m to the point."