If a cheerful topknot is summer’s most charming strategy to beat the heat, a low bun channels a sleeker brand of off-duty elegance. One with plenty of options: Spotted on a stroll in Manhattan yesterday, **Vanessa Hudgens’**s slicked-down center part acted as a razor-sharp counterpoint to her flowing maxi dress. Also in town, Rosie Huntington-Whiteley whisked her blowout into a messy twist that left out a few billowing strands—a laid-back spin on the style that was bound to get even better with a little wind-swept texture. Here, two breezy hair upgrades made for a steamy day.
