When I saw her, I fell in love with her at first sight.
The very first moment I saw her, I knew that I had fallen in love with her.
The moment I saw her, I had a crush on her.
"今の彼女と出会ったきっかけは一目惚れでした"
一目ぼれ fall in love at first sight, have a crush on ~
まさに最初の時に the very first moment
When I saw her, I fell in love with her at first sight.
The very first moment I saw her, I knew that I had fallen in love with her.
The moment I saw her, I had a crush on her.
日本 
