Long before skunk stripes, dip-dyed ends, and two-toned neon became viral TikTok hair trends, Christina Aguilera broke beauty ground with her legendary take on dual-colored, black-on-blonde hair.

Hayden Panettiere gave the two-toned hair trend a fruity upgrade. The 34-year-old actress took to Instagram on Monday, September 18, to show off her freshly dyed mane, which features green roots ...