I have also done far more intrusive searches than this. I have never discussed it with my therapist because I feel shame about it. I don't want her to know that I sometimes seek a connection. I prefer to steal it and keep it secret. Of all the searches I have done, her LinkedIn profile is probably one I would be relatively relaxed about mentioning because, as LT has said, it is professional. No one here knows whether your therapist will be mad and you won't know for sure until you tell them. It's more important that you can work through any potential negative reaction rather than hoping to avoid it. Assuming your therapist is a decent one, of course...