There are a lot of reasons to love Instagram: you can follow your friends' travels, share your favorite meals (or, um, cupcakes), and, of course, see which celebrities made major hair changes. The new trend for A-listers is to announce a new cut or color via filtered photo, often tagging the pros who created it — which helps us mere mortals know which stylists to book for our next appointments. Keep reading to discover which bigwigs already went brond, strawberry blond, and lavender in 2015!