We received a celeb-stalker sighting this morning: "Ivanka Trump—5th avenue and 57th street - Her hair was a mess. Didn't bother to dry it before leaving her place. Other than that, she looked great." Wet hair? We've got news for for 26-year-old Ivanka, whose job with her dad comes with a fancy title (Vice President of Real Estate Development and Acquisitions) and an assistant: According to Megan Hustad's newish book, How to Be Useful: A Beginner's Guide to Not Hating Work, she's just broken a cardinal rule for young twentysomethings in the workplace.