Wiktionary
cute as a button
a. (context simile English) Very cute.
Usage examples of "cute as a button".
Like Guido and me, she's from this dimension, which is known elsewhere as Klah, incidentally, so there's nothing unusual about her appearance other than she's cute as a button.
He looked cute as a button, but his face went pale the moment he saw the gun.
The third girl was, as James had told me, cute as a button, tiny, olive-skinned, and with huge, liquid eyes and short brunette hair.
She looked cute as a button, eyes bright in her wrinkled face, a broad-brimmed straw hat tied under her chin with a jaunty bow.
An all-American boy, cute as a button-whatever the hell that meant-in his summer blues.
She was also cute as a button, and that was something Wegener had never thought of an ensign before.