How do I ask for this girl's instagram?

So I've talked to this girl in my class and she's pretty cool and I learned today from a friend of mine that she has an Instagram, but she never told me about it. We only know each other a little bit and I have her number and she has mine, but I never texted her before and I have had her number for about 5 months. How can I ask for her instagram without sounding creepy and weird? I Know this sounds ridiculous, but girls usually think I'm weird and she doesn't know that other girls in my school think that I am weird and I don't want to blow it. So can anyone please help?
How do I ask for this girl's instagram?
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