can't keep (one's) eyes off (of) (someone or something)

Cannot stop looking at someone or something because it is so beautiful, visually pleasing, interesting, etc. Your little girl is so adorable—I just can't keep my eyes off of her! The juxtaposition of colors in that painting is so strange that you can't keep your eyes off it. When my wife appeared at the end of the aisle in her wedding dress, I just could not keep my eyes off of her. She looked absolutely breathtaking.