British model Georgia May Jagger is the latest star have a drastic hair transformation. Jagger showcased a rainbow-hued hairstyle on her Instagram page earlier this week. âBronies with@alexbrownsell @bleachlondon. Mermazing hair colour,â she captioned one Instagram image with. Hair stylist Alex Brownsell was responsible for the Rimmel modelâs makeover which features colors including, pink, purple, blue and green.