When they met up yesterday in Los Angeles on the eve of Rihanna's 31st birthday, Salandra first showed the singer-actress-icon different takes on a French manicure , some with fluorescent accents. But then Rihanna suggested putting two different bright colors on each nail, and it took off from there. "She painstakingly picked out the colors she wanted," Salandra says. "She wanted something a little more pastel on the nail itself and complementary colors that would go together. And then she came up with glitter on the nails. We were just making it up as we went along."