Hannah Montana did that once. She was out and about in NYC I think it was, and had left her purse or wallet or whatever at home/hotel. Anyways, she called her dad to bring her money, She wanted a cup of coffee, it was cold out. He told her no. She needed to learn responsibility. She could either walk back to the hotel, or do without... She stood outside of Starbucks singing for money. It took her over an hour to get enough money for a cup of coffee.
That was right after her concert ended demanding well over $100/per ticket.
She said no one recognized her, no one even stopped to look at her.

Amazing how little attention people pay to "street musicians" and "street people".