John Mayer not only has a new love ( Jennifer Aniston , as Us Weekly reports in its latest issue , on newsstands now). He also has a new 'do. The singer, 30, hit NYC's Meatpacking District, where he got his locks styled. His inspiration? Mayer posted photos of Michael J. Fox , Shaun Cassidy , Mary Lou Retton and Kristy McNichol on his Web site as his inspirations. "Today I set off on my newest project; to grow and maintain an authentic ’80s style feathered haircut," he blogged. ...