grin at

grin at someone or something

1. to smile a beaming smile at someone or something. The entire class grinned at the camera. I grinned at her and she turned away quickly. 2. to smile a beaming smile at the thought of, or mental picture of, someone or something. He grinned at the thought of his coming home to his family. He grinned at her as she gazed upon the diamond ring he had given her.
See also: grin
References in classic literature ?
It seemed as though his features had frozen into a diabolical grin at the world he had left and outwitted.
The most trouble he displayed last season was in stifling an appreciative grin at Kowroski's seemingly unstoppable extension that his support had helped make possible in "Emeralds.
Fred pipes up in a goofy voice, twisting his head to grin at Meltzer.