fall under the spell of (someone)

To come under the influence or control of someone because one finds them fascinating, enchanting, or seductive. Our son has never acted out like this before. I think he must have fallen under the spell of that new friend of his. Such was the magnitude of her beauty that countless men have fallen under the spell of the duchess. I've never seen him rush into a relationship this quickly before. It's like he's fallen under the spell of this woman!