Pop Star Gazelle's from Walt Disney's Zootopia and this screenshot's taken from Valve's Garry's Mod.

The pop star of Zootopia herself was enjoying going around any cities and test many vegetables, fruits and certain food out, including the vegetarian pizzas and such. Afterwards, she got her belly so huge and stuffed that it's almost like it's a food blimp. Gazelle feels so proud and bouncy that she would show it off by dancing, making it bounce up and down and cause many BOING sounds as she does so.