Arshad Khan works as a Chaiwala, or tea seller, in an Islamabad marketplace - where the handsome young man was discovered by Pakistani photographer Jiah Ali. She uploaded the photo to her Instagram account, giving it a worldwide audience. The hashtag #chaiwala went viral, and the unknown street seller became an internet star. Now a Pakistani fashion label has signed the 19-year-old ex-chaiwala onto a contract as a model.