Who had the biggest crush on Emma Watson during the Harry Potter films?

I think Daniel Radcliffe had the biggest crush on Emma Watson during the filming of the Harry Potter series. It seemed these two had the most chemistry.

I have heard however, that all of the male co-stars had a crush on Emma Watson during the filming of the Harry Potter movies. Emma Watson herself is horrified at these claims and is said to have not reciprocated any of the feelings.