Wearing heels on a treadmill?

I bought these new heels, but I never wore 4 inch heels before, (i'm used of wearing 1 1/2 and 2 inch heels). I was wondering if it would be safe to wear my new 4 inch heels and walk on the treadmill for 30 minutes so that I can get used to walking with them on. Good idea or dumb idea?
Update: hahaha some of your comments are making me feel like such a dumb *** but thanks
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