cute イディオム

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cute as a bug's ear

petite and pretty, adorable Have you seen her little sister? She's cute as a bug's ear.

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Cute as a bug

(USA) If something is as cute as a bug, it is sweet and endearing.

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cute

cute
1.
meet cute
Film to meet for the first time, often in a contrived or unusual way: said of the main characters in their first scene together
2.
the cutes
Informal cute mannerisms, ploys, devices, etc. designed to charm or attract others

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cute as a button

cute as a button
Also, cute as a bug's ear. Pretty or attractive in a dainty way, as in That baby is cute as a button. Cute originally was a shortening of acute, for “sharp-witted and clever,” but in the early 1800s it also took on its current meaning. Other than that buttons and bug's hearing organs can be small, there is no good explanation for these similes.