The caption is directed to online "trolls" who she says write "unkind things." She writes, "This is how I look. I feel happy" before adding that she thinks she looks "strong and healthy."
Slamming body critics is nothing new for Schumer. She told Glamour magazine it was "not cool" in another Instagram post last month for mentioning her in an issue focused on plus size fashion.
She wrote that there's nothing wrong with being plus-size, but disputed having a plus-size body, suggesting that labeling her body type that way could have a negative influence on young girls.
The gala, attended by the who's who of the global music industry, also saw Indo-British filmmaker Asif Kapadia win the golden gramophone for his film "Amy".
Actor Daniel Craig, who has portrayed the legendary James Bond role for nearly a decade, may leave the character for a character in American television Series “Purity”.
British filmmaker of Indian origin Asif Kapadia on Monday bagged a Grammy Award for his film "Amy", a documentary on the life of late singer Amy Winehouse.