Would it be weird to tell a guy I think he's cute?

So there's this guy that's freakin adorable, we eat lunch near each other. I don't know him but I catch him glancing at me and I really just want to go up to him and tell him he's cute.
Except his always with his friends and I'm pretty darn shy. Would he think it's strange if I did that?
Advice?
Would it be weird to tell a guy I think he's cute?
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