Why did my male Prof. give me a look of profound admiration when I went up for my Cl Presentation? He keeps?

picking on me in cl although I am very quiet. The other students tease me about him. He stares at me until I take notice and it unnerves me. He came up to talk to me the other day when I wore my best top. He is married, middle-aged, balding and overweight. But, I think he is a great Prof. Does he have a thing for me, like everyone suspects?